Kavetham

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

Canon
Kaveh and Alhaitham are currently both NPCS, though there is a lot of information known about them. Both Kaveh and Alhaitham graduated from Sumeru Akademiya, Kaveh graduating from the Kshahrewar Darshan, while Alhaitham graduated from the Haravatat. AlHaitham is current 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 creating his magnum opus, Alhaitham invited Kaveh to stay over at his home, and Kaveh accepted.

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.

Voicelines
Because Kaveh and Alhaitham are NPCs for the time being, they don’t yet have voice lines for each other. However, other characters mention interactions they have witnessed.

In Collei's line about Kaveh, she mentions how when Cyno invited him for dinner, he ranted about Al Haitham the entire time, and nobody else was able to get a single word in.

In Nahida’s line about Kaveh she expresses surprise at the fact that he is living with Alhaitham, and Tighnari says he doesn't know whether it's a blessing or a curse.

In Tighnari's line about AlHaitham, he says it is thanks to him that Kaveh "has more pent-up frustration than an angry Anemo Slime."

Akasha Pulses, the Kalpa Flame Rises=
Their first on-screen interaction is in Act V, where they argue as Kaveh doesn't believe Alhaitham is sincere about the possibility of Kaveh becoming a sage, as Alhaitham almost was. Alhaitham retorts that if Kaveh can't stand his personally, he is welcome to move out of his house, which Kaveh expresses annoyance at. 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 says Kaveh is not his friend, but his roommate, and that the reason he seems to have so many problems is that he never listens to him.

Later, in the House of Daena, you have the option to witness another conversion 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 spreading rumors, and Alhaitham taunts him for not having 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.

Quotes
"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."

- Alhaitham to Kaveh

Fanon
Ever since information about Kaveh’s personality and the fact that he and Alhaitham are roomates was revealed, people started shipping the two. 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 also like to speculate about their university days and what their relationship was like then, if they had a competitive relationship or were more friendly with each other. Many people make comics of them interacting in their younger years, some coming 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.

Currently, the pair has roughly over 360+ works on Ao3, and is growing fast in popularity as Kaveh has finally been released in the game itself. 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.

Fandom
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Trivia

 * Both Kaveh and Alhaitham have dendro visions, Al Haitham uses a sword while Kaveh uses a claymore.
 * Alhaitham’s English voice actor ships Kavetham, and made a joke about it on his social medias
 * Quite a few voice lines that other characters have for Kaveh or Alhaitham mention the other one.