KaeLuc

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

Canon
About Kaeya and Diluc's first meeting, it was when they were around 12 years old, when Kaeya was taken in by Crepus Ragnvindr as well known as Diluc's father. It's said, that Kaeya and Diluc are sworn brothers. The Ragnvindr Family is known to be a noble family in Mondstadt. It's been said that it has been a long time since he called Diluc his brother.

They seem to have a love/hate relationship, especially after the events that happened regarding Crepus's death: Kaeya revealed to be a spy from Khaenri'ah, so they fought and Diluc left, while Kaeya received his vision.

In the Chinese version, it's said that Kaeya used to call Diluc "adoptive older brother" ( 義兄弟 yì xiōng in Chinese), meanwhile Diluc refers Kaeya as "younger brother" (义弟 yì dì in Chinese)''. However, Crepus rereferred Kaeya as a adopted son in Kaeya's character story.

'Article' to why it's canon:

https://kaelucproof.carrd.co/

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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