- Kaeya does not like grape juice because it reminds him of when he was abandoned by his biological father near Dawn Winery. His father had told him that he would bring back some grape juice for their trip back, but he never came back. Since then, he had disliked grape juice. It really isn’t the taste or the smell, but because of the memories.
- Kaeya hates thunder. Two reasons. It was thundering the night he was abandoned. And it was thundering that night when Diluc and him fought.
- Sometimes, when Kaeya’s on break, he goes outside to feed the stray dogs walking around the city. He’s always wanted a pet, but Crepus didn’t want a dog running around the mansion and Diluc didn’t like dogs, obviously, he respected their wishes since they had already done so much for him.
- At night, Kaeya sometimes takes walks around the city. He likes the peace and quiet. He usually does this after drinking at the Tavern to clear his head.
- Due to his nightmares and Kaeya's paperwork, he doesn't get much sleep at night. The nightmares come every so often, but prevent him from getting a good night’s sleep.
- When I say that Kaeya loves the beach, I mean loves. He often goes by the shore to collect seashells. It reminds him of when he and Diluc used to collect seashells together.
- Kaeya keeps a specific seashell in his pockets, it was one given by Diluc. He fiddles with it when he gets nervous.
- Absolutely no one can tell what Kaeya’s been through or what he’s done (in the past/currently). Kaeya does have some difficulty trusting others but if offered a good trade, he might tell you one of his many, many secrets.
- He loves, loves, loves talking with Klee and Bennett, and occasionally Razor too. It makes him feel like he can change even more, into a different person, perhaps? He still knows where his origins lie. He also loves the feeling of acting like a big brother.
- When drunk, he still manages to avoid talking about his past. But he is a bit more open about other things.