Kavetham

Kavetham is the slash ship between Kaveh and Alhaitham from the Genshin Impact fandom.

Canon
"I can't deny that he's very smart. However, it's a shame that a man of such talent only pays attention to the truth itself and not to the people around him. Or perhaps this is due to an extraordinary sense of individualism, which causes a lot of problems. For example, he doesn't seem to respect his seniors... Of course, I'm not referring to myself specifically."

- Kaveh in Alhaitham's Official Introduction.

"Mainstream Sumeru academia tends to hide a certain fact from time to time, which is that for some people, talent can occasionally be more of a burden instead. Nevertheless, this view can also be but an excuse. In truth, it is your character that determines your destiny first and foremost. The aforementioned ideas are the sort that Kaveh will persistently rebut."

- Alhaitham in Kaveh's Official Introduction.

Alhaitham is currently a playable character while Kaveh is an upcoming character. They are frequently mentioned throughout character voicelines and Sumeru bulletin boards. Both Kaveh and Alhaitham graduated from Sumeru Akademiya, Kaveh graduating from the Kshahrewar Darshan while Alhaitham from the Haravatat Darshan. Alhaitham is still a member of this Darshan, and is responsible for documenting their findings and drafting ordinances. Kaveh taught an architectural elective while he was at the Akademiya, but is mostly known for being the architect behind the Palace of Alcazarzaray. After he went bankrupt despite his magnum opus, Kaveh came over to live with Alhaitham, to which Alhaitham accepted. Alhaitham is noted to have handled Kaveh's rent and other additional fees, such as alcohol fees, in the Sumeru bulletin boards.

Alhaitham is only interested in studying whatever interests him, having forgone ownership of a supposed Divine Knowledge Capsule to simply study it. He also operates purely by rationality, which many people tend to find unacceptable, especially Kaveh, who is extremely fed up with him. In contrast, Kaveh operates by what he feels is right. He is a stark defender of the arts and believes that helping others is a natural course of action. Several playable characters and NPCs mention their arguments, and their intense disagreements are such that they even bleed into messages on bulletin boards across Sumeru City and Port Ormos. Messages between Alhaitham and Kaveh can be read in the Mahamata Bulletin Board, Puspa Café Message Board, and the Port Ormos Bulletin Board.

Alhaitham’s character trailer features Kaveh, Cyno, and Tighnari gossiping about Alhaitham in Lambad's Tavern. Kaveh starts off the video by continuing a conversation between the group about how Alhaitham called himself a "feeble scholar," stating that it was a bold-faced lie and proceeding to ask with clear signs of interest how strong Alhaitham is, before asking Cyno whether Alhaitham is stronger than him. Later, Kaveh pointed out how he met Alhaitham during his desert expedition, wondering why Alhaitham didn't travel with him instead when it could have halved the traveling costs. Alhaitham eventually arrived to the tavern, looking over at Kaveh before he overhears what the group is discussing. His gaze lingers as he sits down next to Kaveh as Kaveh finishes off the conversation by pointing out people should not mess with his roommate no matter how strong he is. Alhaitham tells him that he should have learned to think before he spoke and reveals that he came to the tavern because Kaveh had dragged him there, to which Kaveh replies defensively that the gossip about him had all been positive. When Alhaitham tried to provide an explanation to the confusion regarding how he referred himself as a "feeble scholar," Cyno and Tighnari both expressed confusion by the end of his philosophical lecture while Kaveh sighs that he should never have brought up the topic with Alhaitham. By the end of the video, Alhaitham comments on the wine being good and that he'll have a cup. However, there are only three goblets on the table for the other three people, respectively. It is speculated that Alhaitham may have drank and tasted the wine from Kaveh’s cup, though it is also possible that he knew the quality of the wine because he frequently visits the tavern with Kaveh according to the in-game message boards and dialogue.

The two share matching idles, of which is also the first occasion where two characters have matching idles. Alhaitham's second idle features him pulling out house keys, initially surprised that Kaveh's is accidentally hooked onto his, then shrugs as he put it back. In Chinese, Japanese and Korean, Alhaitham stares at the keys and lets out an irritated “Tch!” while in English, Alhaitham mutters a surprised “Wait, huh? Oh... Eh... Mmm, whatever. ” Zooming in on the animation shows him briefly smiling while examining the keys. Kaveh's second idle features him searching for something in his belt, panicking when he realized it isn't there, then looking to the ground, disheartened.

On Genshin’s Chinese social media, the short versions of Alhaitham and Kaveh’s descriptions can form a Chinese duì lián when put together.

Alhaitham: 学识, 思考及处事之道 (Knowledge, Contemplation, and Way of Comportment)

Kaveh: 体悟, 仁爱与识美之知 (Empathy, Compassion, and Understanding of Beauty)

The English version translated of these texts slightly differently, swapping Alhaitham and Kaveh’s areas of expertise with each other while describing them.

Alhaitham: The art of learning, thinking, and doing

Kaveh: The knowledge of comprehension, benevolence, and aesthetics

Alhaitham and Kaveh’s character themes have similar leitmotifs.

Alhaitham's Character Story 4
The following is directly copied from Alhaitham's in-game Character Story 4, which elaborates on the story behind his cushy house and relationship with Kaveh.

"To live a peaceful and comfortable life, one must meet a few requirements first: Congruous personality and logic, adequate fighting prowess, a slow-paced job, and a cushy house in the vicinity of one's office.

Alhaitham has checked all the boxes above. He would never deny that no place suits him better than the Nation of Wisdom, where social capital is linked to one's academic abilities.

His current house, which is located near the Akademiya, is one of the academic resources that he gained through promising research projects. This house's story dates back to Alhaitham's student years. If his classmates still remember him, they will recall that he was not one to mingle with the crowd. As a result, he has only participated in one joint research project. Despite its eventual success, the project resulted in a huge quarrel and a parting of ways. Little do people know about Alhaitham's part in this story, though they might be acquainted with the other protagonist: The Kshahrewar architect Kaveh.

This academic incident is not very widely-known — and in truth, the tale of two geniuses falling out due to differing perspectives is an all-too-familiar one in the Akademiya. But even though their collaboration did fall through, neither of them will deny the other party's exceptional brilliance. As for their research, the Akademiya would later transfer the relevant assets to the researchers involved as per regulation.

Although the two did not continue that research, its great success in the early stage still serves as compelling proof of Alhaitham's academic ability. Later, the Akademiya even used this project, which they had forgotten to cancel, as a reference for allocating housing resources, and as such, Alhaitham was given a very decent house befitting his participation in this ingenious project. But the other contributor, Kaveh, had never approached Alhaitham regarding that allocation. It wasn't until later that Kaveh had someone inform Alhaitham and the Akademiya that he was not in want of a house and thus had no use of this property.

When next they met, Kaveh had gone bankrupt. According to Alhaitham, this former friend of his possesses a personality and values that are not congruous with his abilities. The two differ on too many things and cannot reach a consensus even today.

Allowing Kaveh to stay in this house provides Alhaitham with an interesting research topic: Legally and socially speaking, since Kaveh has previously forfeited the right to his half of this house, he should pay the landlord during his stay. However, paying rent would, to some extent, deny his contribution to the research, which contradicts the academic spirit.

An intriguing matter to consider, but Alhaitham has no interest in the answer. Thus, he has taken his broke former colleague in, collects rent as the rightful landlord, and gives his colleague some household chores. He is well aware of the dissatisfaction Kaveh might have, but it matters not to him. As far as Alhaitham is concerned, Kaveh is a familiar face, similarly lacks familial attachments, and is the polar opposite of himself as a scholar — that is to say, an excellent mirror. Human vision is limited, but it can be perfected through the presence of another genius. Taking this opportunity, Alhaitham will be able to observe other aspects of this world and thus understand more things that may have otherwise been unfathomable."

Alhaitham’s Home
Alhaitham’s home is a domain that can currently only be visited during Vultur Volans Chapter: Act I - The Illusions of the Mob. Once it is exited, it cannot be reentered.

As explained in Alhaitham’s Character Story 4, the property initially belonged to both Alhaitham and Kaveh and was allocated to them by the Akademiya as a reward for their joint participation on a successful project. However, Kaveh eventually forfeited his share of the property, leaving Alhaitham as the sole owner. An unspecified amount of time later, Alhaitham would move Kaveh in with him after learning of the latter's bankruptcy and currently serves as his landlord.

Neither Alhaitham nor Kaveh refer to Alhaitham as a landlord anywhere outside of Alhaitham's Character Story, instead choosing to refer to each other as the other's "roommate." This is consistent across all of Genshin Impact's translations.

Interior
A closer inspection of Alhaitham’s home shows numerous items designated for two people around the house. For example, there are three pots with two cups for each on the living room table along with two bowls of fruit. According to Kaveh, Alhaitham never has guests over, so it is very likely that he and Kaveh spend time in the living room together. There are two "An Elegant Voice" Dutars leaning against the wall, as well as several benches with side by side seat cushions.

There is a study with a large desk in front of a bookshelf and a floor-level desk in front of a window and within arms reach of another bookshelf. Among the various items on the large desk are a "Light of the Land of Wisdom" lamp, several books, a magnifying glass, and a sextant, while the shorter desk also has its space occupied with some books and a "Two-Way Iron" lamp. It's speculated that the larger desk belongs to Alhaitham while Kaveh uses the shorter desk, or alternately, they share both desks for their work.

Also in the study, there is a double-seated bench that is positioned in front of a table with bowls of fruits, a "The Mellow Pot" set, a "The Twisting Mist" censer and a few books on it, making it likely that this may be one of the places where they eat. Alternatively, it could be another resting place, as it is positioned in front of a window and sits within arm's reach of a large bookshelf. There is also a Kamera on a tripod inexplicably situated beside the table.

There are also two short hallways leading to inaccessible doors, which are speculated to be Alhaitham and Kaveh’s respective bedrooms. It is also possible that these doors lead to other rooms of the house, such as bathrooms or the kitchen, though either way, whatever is behind these doors is un-rendered.

While it has yet to receive any official confirmation, the hallway decorations hint at the idea that the inaccessible doors lead to Alhaitham and Kaveh’s respective bedrooms; The hall leading to the first inaccessible door is where Kaveh hung his painting, implying that it is his wing of the house. On the floor, there is a red seat cushion with a gold, red and turquoise flower design, mirroring the colors of Kaveh’s outfit. There is also a broom leaning against the wall. Kaveh’s complaint that Alhaitham never helps him with the housework makes it unlikely that the broom belongs to him.

In the second hall, there is a drawer/shelf with numerous books lined along it, along with a chest and a pot. Alhaitham is an avid bookworm while Kaveh in the Archon Quest expressed a lack of interest in physical books, making it unlikely that the books belong to him. Further supporting this idea, there are no books in the hall with the painting, despite there being books scattered everywhere else in the home.

Voicelines/Character and NPC Mentions
"I hope my roommate won't be hammering away on another one of his projects in the dead of night... Actually, I'd prefer if he wasn't home at all. I really don't want to wear my soundproof earpieces to bed."

- Alhaitham's Good Night voiceline.

"Kaveh tends to be overly sensitive about everyone and everything he crosses paths with, and he's constantly making a fuss about nothing. Maybe it's because he's too emotionally fragile…"

- Alhaitham's About Kaveh: Overly Sensitive voiceline.

"Someone set up a stand on the street saying that for each handmade keychain they sold, a child in poverty would be given a meal. Kaveh bought at least a dozen. ...This is Sumeru, where even healthcare is free. I needn't say more."

- Alhaitham's About Kaveh: Getting Duped voiceline.

"Apparently, a lot of people think he has a bad temperament, but I don't think they're giving him a fair chance. When Kaveh built a house right over a Withering Zone and created a huge mess, it ended up being a real headache for the Forest Rangers. Even so, this Forest Ranger didn't hold it against Kaveh. He even invited Kaveh to his house for a meal. Hmm, maybe it's good people like him who allow people like Kaveh to survive."

- Alhaitham's About Tighnari voiceline.

"Let's not eat here. Mind if I... take it home?"

- Alhaitham's Receiving a Gift: III voiceline.

"The General Mahamatra once brought him to our place for a meal. From the moment the fruit arrived on the table, he ranted non-stop about his difficult and stubborn roommate for the entire meal. We didn't get a single word in the whole time. We just nodded along and tried to stifle our laughter. It took a lot of effort."

- Collei's voiceline about Kaveh and Alhaitham.

"He has an almost-perfect grasp of what it truly means for Sumeru to be a Nation of Wisdom. Sadly, the truth as he understands it will never be accepted as the mainstream. Hmm? He's roommates with Alhaitham? Wow... the world really is full of surprises..."

- Nahida's voiceline about Kaveh and Alhaitham.

"Kaveh is a famous architect in Sumeru. The Palace of Alcazarzaray is his magnum opus. During the initial planning, he even asked me to recommend suitable ornamental flora. I don't know why or how, but he ended up heavily in debt after the palace was completed. Alhaitham is helping out by letting him stay at his place, but... I don't know whether that's a blessing or a curse..."

- Tighnari's first voiceline about Alhaitham and Kaveh.

"Be careful of Alhaitham. I'm not saying he's a bad guy, but he purely operates by rationality, so people often find his actions unacceptable. If you don't believe me, just ask his housemate — thanks to Alhaitham, he has more pent-up frustration than an angry Anemo Slime."

- Tighnari's second voiceline about Alhaitham and Kaveh.

"Paimon: Ah, look! Is Alhaitham taking a nap? Traveler: Shh... You're too loud, Paimon. Paimon: Th—That's not true... Paimon was definitely whispering... Traveler: So, what do we do now? Someone opened the door for us, but who's going to wake him up... Traveler?: Paimon heard it was his birthday today and wanted to stop by and say 'hello.' Why don't we leave him a note? Paimon: Paimon... Paimon isn't going to be the one to call him! If Paimon wakes him up, he's going to start asking lots of impossible questions!"

- Alhaitham Birthday 2023 Twitter Caption (EN).

Using Nahida's skill after Act V to read the mind of Panah, an NPC located in the House of Daena, would show his thoughts of how Alhaitham and Kaveh begun arguing again.

Possible Mentions
The following scenes are vague and only possibly related to Kaveh and Alhaitham.
 * Lambad, an NPC located in Lambad's Tavern, had his tableware damaged possibly in a fight between Kaveh and Alhaitham, as the new tableware in the tavern is said to be made by craftspeople commissioned by Kshahrewar researchers and patterns designed by Haravatat researchers. Given how often Kaveh and Alhaitham reside by Lambad's Tavern and how the tavern was featured in Alhaitham's demo, it is very likely the fight was between Kaveh and Alhaitham.
 * In Archon Quest Chapter III: Act II — The Morn a Thousand Roses Brings: The End of Sabzeruz Festival, the Traveler and Paimon discover a letter Dunyarzad left for them on a compilation of folk legends concerning Lesser Lord Kusanali, created from a series of interviews that she conducted in succession and wrote down. One of the stories goes: "There was this one time when I'd had a wee bit too much to drink and couldn't find my way home to save my life. Then, when I turned a corner, I could've sworn I saw Lesser Lord Kusanali. She was very tall and had the most muscular arms, and she caught me when I slipped and fell. The next morning, I found myself sleeping under a tree. I reckon that must've been her looking out for me!" The transcription is possibly from Kaveh, as he is often noted to be an alcoholic and Alhaitham is a notably muscular person.
 * Contradictions that Nahida has observed in human behavior are mentioned in Nahida's Character Story 1, one of which is that some people have a tendency to say brutal things when spending time with someone they truly love. While the translation may change the wording, the general meaning remains the same. This is an ambiguous mention, as while this description could apply to Alhaitham and Kaveh's relationship due to their tendency to argue with each other despite the fact that it is implied that they still care for each other, it is unknown how much Nahida knows about how they interact, as according to her "About Kaveh" voice-line, she had no idea they were living together despite seemingly having a deep understanding of both characters. However, she could have observed their interactions while they were out and about, as the two are known for arguing in public. Furthermore, there are no other known major Sumeru characters about whom this observation could have been made.

Akasha Pulses, the Kalpa Flame Rises
Kaveh is first indirectly mentioned in the Archon Quest when Alhaitham stated that his place was finally in peace now that he temporarily had it to himself. When Dehya questioned him on what he was speaking of, Alhaitham replied with "Oh, huh, nothing."

Their first on-screen interaction is in Act V, where they argue as Kaveh doesn't believe Alhaitham is sincere about his praise of him as a master craftsman or the possibility of Kaveh becoming a sage, as Alhaitham almost was. Kaveh dismissed Alhaitham’s sarcastic compliment, the latter claiming that it was sincere, and Kaveh responds that it’s because Alhaitham has never said anything good about him before. Alhaitham retorts by saying that Kaveh has never said anything good about him either. Kaveh then call him arrogant, which prompts Alhaitham to say that if Kaveh can't stand his personality, he is welcome to move out of his house, which Kaveh considered a threat. Alhaitham asks what Kaveh was doing while away from Sumeru, irritated that he was not there in its time of need. Kaveh is confused as to what happened while he was gone, and decides to ask around to figure out what Alhaitham is referring to as he claims he's done speaking to him.

After talking to Alhaitham, Paimon, who witnessed their previous conversation along with the Traveler, asks Alhaitham if Kaveh is his friend. Alhaitham retorted, "Do we look like friends?" possibly averting answering the question given their past relationship, and instead replies that Kaveh is his roommate, and the reason the latter seems to have so many problems is that he never listens to Alhaitham. Interacting with Alhaitham again triggers a voiceline in which he stated how he originally planned to stay in the House of Daena longer, but later decided to go somewhere else due to how Kaveh might show up again, which is a "nuisance." However, Alhaitham stayed nonetheless.

Later, in the House of Daena, the player has the option to witness another conversation between Kaveh and Alhaitham. Kaveh tells Alhaitham that the people want him to replace Azar as the Grand Sage, and Alhaitham says that has nothing to do with him. Kaveh says it's likely people without any real information were spreading rumors, and Alhaitham tells him that he hasn’t learnt a single crucial bit of information the whole time he was out there. Alhaitham tells him all the sages have been exposed and removed as Azar's accomplices, and Kaveh wonders if that was why they sent him out on a project.

Later, at Nilou's afterparty, Alhaitham mentions that he realized he "accidentally" brought both house keys with him when he left their house, but shrugged it off.

Alhaitham's Story Quest
The first mention of Kaveh occurred near the end of the quest, when Paimon nagged Alhaitham on answering her questions. However, as the timing then had been over Alhaitham's working schedule, Alhaitham refuses to further commit to work-related activity and turned to leave. When Paimon kept pestering him, Alhaitham chastised, "Are you done? Your behavior is reminding me of some other people," in irritation. Paimon angrily remarks that he is switching the topic. Later, it is revealed that Alhaitham planned on continuing the conversation in his own house.

When the trio arrives in the house, Kaveh can be found in the hallway. He greets Alhaitham and initially wanted Alhaitham to help him straighten a painting the latter had placed in the house, but stops midsentence in surprise when he sees the two unfamiliar faces in the house behind Alhaitham. Alhaitham scoffs that the Traveler and Paimon are obviously guests and that Kaveh is making too much of a fuss. Kaveh realizes that the two are not from the Akademiya and panics that there are now people who knows he lives in Alhaitham's house because he’s broke and in debt, to which Alhaitham remarks sarcastically that only now did Kaveh start feeling embarrassed about that matter. Alhaitham soon left to get the books the Traveler needed to answer his questions, leaving Kaveh to talk with the duo. Before he walked away, Kaveh angrily berates Alhaitham for leaving so abruptly.

The first thing Kaveh asks the Traveler and Paimon as they settle down is whether they're actors hired by Alhaitham to pretend to be his friends, towards which Paimon is dumbfounded. Kaveh sighs and states that the reason he asked this is because he was surprised when Alhaitham had never invited friends to his house before, given his temperament and personality. Paimon questioned Kaveh about being Alhaitham's friend, to which Kaveh replied with a smile, "Uh... not 'friends' exactly...," and later elaborates that they used to be friends, then looked away when he said that it is no longer the case. He changes the subject abruptly at that and fully introduces himself to Traveler and Paimon, asking them not to give away how he lives with Alhaitham, to which Paimon responded playfully that Kaveh must pay her in order for her to keep her mouth shut about the matter. Kaveh exasperated, pointed out that of course the duo would treat him in a way Alhaitham often does, given they are friends with Alhaitham. Alhaitham eventually returns, commenting on their loudness, and Kaveh leaves, upset, telling Alhaitham to entertain his own friends.

Kaveh eavesdrops the proceeding conversation between Alhaitham, Traveler, and Paimon. When Alhaitham commented on the humanity within humans, Kaveh comes out to sarcastically point out the irony in how Alhaitham was one to have considered humanity and emotion at all. He states that if humans aren't humans without humanity, Alhaitham might as well have evolved into another species in another decade, referring to Alhaitham's extreme rationality. Alhaitham returns the argument by stating how Kaveh may as well have devolved into a fungus, to which Kaveh answers that he'd at least be a fungus with empathy.

Clearing his throat, and seemingly just remembering that they have company, Kaveh turns to the Traveler and apologizes for eavesdropping their conversation, and Paimon tells him that a strange researcher had targeted them and brought them trouble. Kaveh worriedly asks whether they are okay, and Traveler replies that it was actually Alhaitham that the researcher had it out the most on. Kaveh instantly changes his tone and chided Alhaitham, saying that if he'd stayed indoors that day, the whole situation would have been avoided. He adds in how Alhaitham could have helped with the housework for once pointing out that his books are everywhere and unorganized. Alhaitham sighs, and points out that Kaveh has a lack of conversational skills, to which Kaveh easily rebukes at the pot is calling the kettle black. However, he glances at Alhaitham again, asking whether he is okay. Alhaitham replies that he is doing quite well, much better than the painting Kaveh is trying to hang on the wall. Kaveh becomes upset and leaves again.

Kaveh doesn't appear again until the second to last shot of the main cutscene, in which he lingers in the background as Alhaitham talks about the importance of keeping one's priorities straight. He is shown scratching his head at the painting he hung up at the beginning of the quest. Alhaitham orders the Traveler and Paimon from his house so that he can go get dinner and advises them to do the same, though he is eventually found to be chatting with Kaveh instead.

If the Traveler chooses to stay in Alhaitham's house by the end of the quest, they can trigger another harangue between Alhaitham and Kaveh if they enter the two's office. In this cutscene, Alhaitham and Kaveh discuss Siraj's incident and bicker about matters related to their jobs in the Akademiya. After Alhaitham yet again called out Kaveh's embarrassing deals, Kaveh revealed that he had took time out to clean the living room for Alhaitham only to receive such treatment. Alhaitham straightforwardly replies that Kaveh should pay his rent soon, as he plans to buy furniture with that Mora. Kaveh criticizes Alhaitham's taste in decoration, and the two begin insulting each other's skill and tastes again. Later, Kaveh circumscribes that if Alhaitham were to buy furniture, he must take Kaveh along with him. Alhaitham retorts that Kaveh only said so because he wanted Alhaitham to buy him drinks, to which Kaveh happily confirms. Alhaitham stated that the idea was ridiculous and that Kaveh would have needed to pay him back eventually. At the end of the conversation, Kaveh tells Alhaitham to tell the Traveler and Paimon to keep the secret in which they live together since he’s broke and in debt, and Alhaitham remarks that there is no need to hide the fact so carefully when Kaveh is such a lightweight that a few drinks in the tavern had him spilling out all his secrets. The scene ends with Kaveh panicking whether everyone knows that he lives with Alhaitham now and that he’s barely has mora.

Using Nahida to read Kaveh's mind in the second cutscene would reveal him panicking over how Alhaitham or other tavern owners may have spilled his secrets, and he wondered whether Alhaitham knows about his drunken scribbling. Using Nahida to read Alhaitham's mind would show thoughts over tidying books, implying that he conceded to Kaveh’s complaints about his books being unsorted.

Mistranslations and Voice Misdirection
The English version of the game presents a considerable amount of mistranslations and voice misdirection that often lead to misconceptions or antagonism of the ship, primarily on Kaveh's behalf. Alternatively, it could also be seen as a different interpretation of the ship.

Unlike the CN, JP, and KR versions of the game, Kavetham in EN is significantly more sarcastic and dramatic, primarily in the voice acting. It excluded many of the tone shifts present in the original CN version of the game and, in many cases, modified lighthearted and joking themes to be more serious and sometimes aggressive. Within the scripting, a considerable portion of Kaveh's dialogue is modified in EN to include capslock or interrobangs instead of the regular question or exclamation marks in the CN script, while specific tonal emphasis and hyperbolization not present in three other languages is placed into phrases in a way that can change the connotation and themes of entire dialogue branches. Two examples of modification of scripting in which the translated script comes off more negative than the original script include:

CN Kaveh: Stop reading that annoying book — come on and tell me, what happened in the Akademiya? [...] Yeah right, it's just something you got with your authority, forget it. I came back today to hear that the sages have disappeared!
 * EN Kaveh: Just put down that worthless book and tell me what happened in the Akademiya. [...] It doesn't matter, it's probably just another thing that you used your authority to get your hands on anyway. Just put it aside. Listen, I came back today only to hear that the sages have disappeared!

CN Kaveh: He could rather have helped me out at home with the housework. Look at those books over there — they haven't been tidied for long. Since they're books you would't normally read, just don't put them all outside!
 * EN Kaveh: Plus, he could have helped me with the housework for once. See those books? They've been sitting there waiting for someone to sort through them for an age. If you're not gonna read them, tidy them away! They don't belong there!

Though this is more prominently seen as localization of the script to fit comedic tropes of the West or as an alternative interpretation of the relationship dynamic, it sometimes attracted negative attention from the fandom in how Kaveh can be considered to be much more demanding, disrespectful, and negative in EN compared to the characterization in the three other languages. Indeed, fandom interpretations of Kaveh vary considerably between Asian medium and Western medium.

There are also minor differences in Alhaitham's Character Story 4 between the original CN and the EN translation, particularly concerning the last paragraph which downplays Alhaitham's closeness to Kaveh.

Original Chinese Version: In Alhaitham's view, […] who know each other from the inside out (alt trans: "by heart",  "through and through", essentially meaning that they have mutually deep understanding of each other)

English Translated Version: As far as Alhaitham is concerned, Kaveh is a familiar face.

Quotes
"Alhaitham: Don't sound too surprised now. You're the renowned Kaveh, light of the Kshahrewar. Besides, as a master builder and craftsman, chances are you'll be appointed as a sage, too. Kaveh: ...Hmph. Why do I feel like you don't really mean it? Alhaitham: Hmph, what makes you say that? Why would you question my heartfelt sincerity? Kaveh: Maybe it's because you've never said anything good about me before. Alhaitham: Yeah, well, I share a similar sentiment. And anyone who knows you as well as I do would surely do the same. Kaveh: Ugh, you...!"

- Alhaitham to Kaveh, Act V.

"Kaveh: Sorry for eavesdropping, but what happened to you guys? Are you in trouble? Paimon: Sort of. We encountered a strange researcher that had it out for us... Kaveh: Are you all okay? Traveler: To be more precise, they had it out for Alhaitham. / We just happened to be there. Kaveh: Huh, so that's how things went...*sigh* Such is life. If only he'd known, Alhaitham could have stayed today, and the whole thing could have been avoided. Right? Plus, he could have helped me with the housework for once. See those books? They've been sitting there waiting for someone to sort through them for an age. If you're not gonna read them, tidy them away! They don't belong there! Paimon: Ah... Uh... Alhaitham: ...Can you feel the awkwardness in the air? I hope you're aware of your lack of conversational skills. Kaveh: Oh, so the pot's calling the kettle black, is he? Hmph, well, having said all that, are you okay?"

- Alhaitham's Story Quest.

"Alhaitham: I'm not even interested in being one of the Six Great Sages. Like I said before, I don't like being a leader. Paimon: Oh, all right. So are you busy these days trying to find others to take the job? Alhaitham: That's not my job, either. I'm only responsible for handling important affairs within the Akademiya before the new sages take office. Traveler: So you're still a leader now, even if it's just temporary. Alhaitham: Hah, and the first thing I'll do is reject Kshahrewar's application for funding."

- Act V.

"Kaveh: The stories Mr. Maddah tell may be old-fashioned, but he's quite skilled when it comes to controlling their pace. Kaveh: But everyone's used to getting their information from Akasha now, so they unconsciously overlook such sophistication of technique and artistic maturity. Alhaitham: You need to be more realistic. No art form is eternal. The day when all of its value has been exploited is the day it loses its reason for existence. Alhaitham: Like how overripe fruits fall to the earth and provide nourishment for new plants. Kaveh: And that is exactly why I've always despised materialists like you. Art is a precious fruit of leisure. You can't compare it to production and exploitation for commercial purposes! Alhaitham: Leisurely people are like people walking on a spherical ground — they don't exist. Why don't you use your brain and think for a moment? Can the production of anything exist without commercial exchange? Acting Manager's Reply: What a sharp clash of theories... Anyways, it's time for Mr. Kaveh to settle his bill for the month. Should it be put on your tab as usual, Mr. Alhaitham? Alhaitham: No. That spoiled guy needs to experience the brutality of the business world."

- Pupsa Café Message Board message, titled "Kaveh and Alhaitham".

"Message: This is embarrassing to say. We were workers that maintain merchant ships here, living off the maintenance skills passed down from generation to generation. Message: But some time ago, new technologies have been added to the Akasha, and our years of experience have become worthless. Young people can still learn through the Akasha, but old stuff like us have no choice but to change jobs. Message: The Scribe said we can go to sea and try our luck, but we have no money for something like that right now. If you have any gigs, please come to us. Kaveh: Don't listen to the Scribe. I happen to know a big client who needs craftsmen. I'll introduce you to her. Take the money too. Forget about going to sea. Alhaitham: I wish you could do less meaningless things. Some people will succeed and some will fall, that's how the world works. Why interfere with it just to act like a goody-two-shoes? Kaveh: Here the Scribe goes again with the mysticism. Why did I do this, you say? Because it makes me happy! Kaveh: And don't you forget that mutual assistance, fairness, and righteous anger are also what drive the world, not nonsense like 'the fittest survives'! Alhaitham: Make no mistake. I have never denied what you meant, but you don't understand what I am saying to you at all. End of conversation. Alhaitham: It's a headache to argue with the impulsive. Anyway, where's your own budget? Don't tell me you're spending all your Akademiya subsidies on such nonsense. Kaveh: 'The poor suffer from the rich's wealth. Thus the rich should give away their wealth for a good purpose.' says the sage Zolfikar. Alhaitham: He never said that. Kaveh: He did. Alhaitham: No, he never said that. And you'll pay for your drinks this month. Kaveh: I won't argue with you about this. But give me a month. I'll prove that he said it."

- Port Ormos Bulletin Board message, titled "An Argument".

"Alhaitham: Have the ten crates of wine that I ordered arrived? I came yesterday only to find out they didn't arrive. Reply: That's impossible! A blond person came in here earlier claiming to be your roommate and took it all. I even remember both of you coming in together the other day. You must have made a mistake. Alhaitham: ...Alright. I get it."

- Mahamata Bulletin Board message, titled "Lambad's Tavern Notice".

"Message: After so many years, this place is still so lively! Every time I come to this coffee shop, I can't help but recall that afternoon I spent arguing with him about the interpretations of a single word. Acting Manager's Reply: Our shop wouldn't be so lively without your patronage. Please do visit often."

- Puspa Café Message Board, titled "Afternoon-Long Argument".

Fanon
Ever since information about Kaveh’s personality and the fact that he and Alhaitham are roomates was revealed, people started shipping the pair. Fans initially speculated that Kaveh might bear a resemblance to Kevin Kaslana from Honkai Impact, since they have similar sounding names and Alhaitham has a similar appearance to Su, who Kevin is close with. Many fans enjoy seeing the discussions between the two, and like the contrast of their personalities. Fans enjoy how they are prone to bickering, but much more like an old married couple than anything truly antagonistic.

People once speculated about their university days and what their relationship was like then, as that if they had a competitive relationship or were more friendly with each other. Many people made comics of them interacting in their younger years while others came up with potential reasons as to why Alhaitham let Kaveh live with him, as if he actually disliked him he probably would not have. It is not uncommon to see them drawn along with Cyno and/or Tighnari, as they also attended the Sumeru Akademiya. After the release of Alhaitham’s trailer, fans were delighted as Kaveh and Alhaitham turned out to be friends with Cyno and Tighnari, which matched the popular fic trope where the duos attend double dates.

Currently, the pair has roughly over 3,500+ works on Ao3, and is growing fast in popularity. It’s rivaled by Cytham, though some people like to pair the three of them together. Given that Kaveh was only just recently released, there are currently no rival ships on his end.

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Trivia

 * Both Kaveh and Alhaitham have Dendro visions.
 * They also have matching Serenitea furniture carpets — "Glorious Emerald Tapestry" for Alhaitham and "The Olive Grove" for Kaveh. It’s also possible that Kaveh had a hand in creating "Musing Tawny Tapestry".
 * In Chinese, these carpets are called "Pattern as Glorious as Malachite" and "Pattern as Glorious as Groves" respectively.
 * Alhaitham’s carpet appears at the entrance of the Palace of Alcazazary, the structure of which is Kaveh’s magnum opus.
 * Coincidentally, a pattern similar to the one on Alhaitham’s rug makes an appearance in Kaveh’s Dendro-infused Claymore attacks. Similarly, the pattern from the "Musing Tawny Tapestry" can be seen on the ceiling of Alhaitham’s burst animation.
 * Alhaitham’s grandmother was a Kshahrewar scholar at the Sumeru Akademiya, the same as Kaveh.
 * Alhaitham’s English voice actor ships Kavetham, and made a joke about it on his Twitter.
 * Both Alhaitham and Kaveh had their splashes released at abnormal timings, four days late for Alhaitham and three days early for Kaveh. Both also released alongside a Dendro Liyue character.
 * In the English version of Tighnari’s "About Alhaitham" voice-over, he refers to Kaveh as Alhaitham’s "housemate" and is so far the only character to do so. This is because in American English "roommate" and "housemate" tend to be used interchangeably despite the terms having different implications regarding one’s living situation in other languages. In Chinese and Japanese voice-lines, he instead refers to Kaveh as Alhaitham’s "roommate".
 * Kaveh is the older one of the pair and Alhaitham's senior.
 * In Alhaitham’s Official Introduction which was provided by Kaveh, Kaveh suggests that Alhaitham has an issue with respecting his seniors.
 * In the Chinese version of Tighnari’s "About Kaveh" voice-line, he refers to Alhaitham as Kaveh’s "学弟", which translates to "junior" or "younger male schoolmate".
 * Alhaitham and Kaveh may be partially inspired by Aristotle and Plato, respectively. This is primarily due to their ideologies matching that of Aristotle and Plato's (Alhaitham a materialist, corresponding to Aristotle, and Kaveh an idealist, corresponding to Plato), how their relationship matches that of Aristotle and Plato's (Plato was Aristotle's senior and teacher, and famously debates on their contradicting philosophies, corresponding to how Kaveh is Alhaitham's senior and frequently debates with Alhaitham on their contradicting philosophies), how their splash art poses match that of Aristotle and Plato's poses in the famous painting School of Athens, along with Alhaitham's many references to Aristotle, such as how he was reading Aristotle's book The Physics in Archon Quest Chapter III: Act IV - King Deshret and the Three Magi - Cry from the Eleazar Hospital.
 * In an unofficial livestream with Alhaitham, Tighnari, and Collei’s Korean voice actors, Alhaitham’s voice actor described Kaveh when he was asked what he thinks Alhaitham’s ideal type is. He later spoke in Alhaitham's voice, "waiting for me, Kaveh?" in a gentle, flirtatious tone.
 * Alhaitham’s 2023 Birthday Art takes place in Alhaitham’s home. This can be gathered through the chair design, the floor pattern, and the mention of Kaveh (referred to as "someone" so as not to distract from the caption being about Alhaitham) letting the Traveler and Paimon inside.
 * The Japanese translation of Alhaitham’s 2023 Birthday caption is the only caption that leaves out the allusion to Kaveh letting the Traveler and Paimon into their home. This is because with the text and the hashtags, the caption would have exceeded the 140 character limit. "You’re being too loud, Paimon", which was likely spoken by the Traveler, was left out of the translation, as well.
 * Alhaitham and Kaveh are one of the only pair of characters to mutually introduce the others playable variant. The only other characters to share this distinction at the time of writing are Cyno and Tighnari, who indirectly introduce each other.
 * Coincidentally, their names on their introduction cards are also mirrored, as Kaveh’s is positioned to the left, while Alhaitham’s follows the usual trend of being to the right.
 * Both Alhaitham and Kaveh have bird-themed constellations; Alhaitham’s is the Vultur Volans (Flying Vulture, EN) or Tiānsǔn-zuò (Peregrine Falcon, CN), while Kaveh’s is the Paradisaea (Bird of Paradise).
 * Alhaitham and Kaveh have canonically wielded weapons from the Tulaytullah weapon series:
 * In the Sumeru Archon Quest, Alhaitham can be seen wielding the sword Xiphos’ Moonlight while fighting Cyno.
 * In Kaveh’s character trailer, he is shown wielding the claymore Makhaira Aquamarine.
 * In some accounts, Xiphos and Makhaira, the owners of these weapons, were lovers prior to Makhaira being sold off to become a court dancer to King Badanah.
 * In the Japanese version of the patch 3.6 live stream in which the voice actors commentate the stream while being in-character, Alhaitham is given the task of reporting core parts of Kaveh’s personality, such as describing Kaveh’s "delicate and sensitive heart" and his ability to understand different human emotions.
 * Alhaitham and Kaveh may be responsible for much of the architecture seen in Sumeru, as the furnishing items Building Block of the City of Wisdom, Contrasts of the City of Wisdom, and possibly Amidst Prospering Markets hint at the abandoned joint that Alhaitham and Kaveh worked on together in the Akademiya, which the Akademiya ended up adopting as a reference for allocating housing resources. If this is the case, it would explain why Alhaitham and Kaveh were given a house to split as compensation for their work on the project, as the house was probably constructed based on their blueprints.
 * They're boyfriends, and they have been married for 2/½ years.