KaeLuc

Kaeluc is the slash ship between Kaeya Alberich and Diluc Ragnvindr from the Genshin Impact fandom.

Canon
Kaeya and Diluc first met as children, when Kaeya was abandoned outside of Dawn Winery by his birth father and taken in by Diluc’s father Crepus. Diluc was 11 or 12 at the time, and Kaeya was likely the same age or slightly younger. The two became friends and saw each other as (possibly sworn) brothers, and were extremely close in their teens. They were well known throughout Mondstadt and were so in sync that many thought they were like twins.

On the night of Diluc’s 18th birthday, he and his father were attacked while traveling home to the Winery. Diluc’s father was critically injured while defending Diluc, and it seems that Diluc had to kill Crepus himself to end his father’s suffering. Kaeya arrived too late to save Crepus. That night, Kaeya revealed his true identity to Diluc— he was a Karenri’ahn spy planted in Mondstadt. This led the two to a life or death confrontation which ended with Kaeya receiving his Vision.

Soon after this, Diluc abandoned his Vision and left Mondstadt for three years.

The events of Diluc’s return to Mond are unclear, but Diluc and Kaeya began working together again soon after, trapping a Fatui diplomat in the Winery’s cellar to interrogate him and sharing intel throughout the events of the webcomic. The two work together to resolve the Black Fire Incident, staging fights against each other and and purposefully getting Diluc captured.

At the end of the webcomic, Kaeya returns Diluc’s vision to him inside of a large ornamental vase. After this, Diluc takes up his vision once again. Despite telling Kaeya that he has no recollection of the vase, Diluc keeps it on display in the winery.

In- game, Diluc and Kaeya seem to have a confrontational relationship but are seen interacting often. Kaeya often attempts to provoke Diluc into sharing his true feelings or giving him a reaction, and Diluc in turn usually gives Kaeya a blank or emotionless reply. Diluc is highly critical of the Knights of Favonius, including Kaeya. The two both have extensive information networks within the city,

During The Darknight Hero’s Alibi, Kaeya purposefully sets up a situation involving Diluc and another Knight, Huffman, seemingly just to see how Diluc will react. Kaeya watches the show unfold and then tells Diluc that he’s happy that the latter now has an assistant when Diluc relies on the Traveler during the ensuing confrontation.

Kaeya and Diluc are also seen together during various other quests in the game, during which they typically exchange jabs at each other. During the Windblume event, despite snipping at each other, they also seem to have a short but normal conversation about how to improve business at Diluc’s tavern.

It’s unclear as to whether Diluc and Kaeya view each other as brothers, sworn brothers, or neither. In the Chinese version, it's said that Kaeya used to call Diluc "sworn older brother" ( 義兄弟 yì xiōng in Chinese), meanwhile Diluc refers Kaeya as "sworn younger brother" (义弟 yì dì in Chinese)  ''. Crepus refers to Kaeya as a sworn son in Kaeya's character story. Note that 義兄弟 yì xiōng / 义弟 yì dì can mean both adopted or sworn depending on the context. The Chinese text is so vague that both is possible. In Crepus’ case, the text can also mean both, but if Diluc and Kaeya are sworn brothers, then Kaeya would be a sworn son, similar to a godchild.

Quotes
"Kaeya? You can only trust half of what he says... at best."

- Diluc's voice line about Kaeya

"You want to know what's in my glass? It's... grape juice. My drink of choice."

- Diluc's voice line about favorite food

"Diluc? He was cute as a young lad. But nowadays he just seems to be in a world of his own... Overall, not much fun to hang out with."

- Kaeya's voiceline about Diluc

"I can't believe that some people actually drink grape juice... if they had a little more patience, they would find that it ferments into the most exquisite wine. Hmph. So unromantic."

- Kaeya's voice line about least favorite food, mocking Diluc

Fanon
This ship is one of the most popular in the entire game, both for the content that leads to the ship and for the hate it gets:
 * As said above, Kaeluc is a ship that viewed in a western environment could be considered incest, but in a eastern environment (as meant to be given the company's location - China), it's considered as M/M ship.

In the Chinese Version (original) it's said that Kaeya and Diluc are referred as Sworn Brothers, which often tends to mean men not related by birth but have loyalty to each other. Meanwhile in other versions like English they're referred as Adoptive Brothers. Due to this conduct it often causes confusion amongst fans if the ship is incest or not depending on their version. Most might see this as a family ship, meanwhile others see it as a slash ship.

Many fanarts, comics and fanfictions have been created for this ship and much likely those are contributing to keep the ship alive. Some may ship them in a romantic settings which tends to be controversial among fans, meanwhile other see it only as brotherly love.

Fandom
FAN FICTION

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