Been thinking of my Kaeya's (bio) parents, cause he deserves to have loving parents, even if they can't be around him.
Screw Kaeya's father being a evil asshole, he scarified so much for Kaeya.
In my lovely dovely au that I created in the early-ish days of genshin lore, Kaeya actually did live in Khaenri'ah, but by some "miracle" (cough cough sacrifice by his parents) he was in a stasis like state for 500 years before conditions worsened enough that Kaeya had to leave.
Kaeya's father, named Emmerich here, was a son of the noble clan Alberich. He was either one of the younger sons, or a cousin, still a part of the clan but not really getting any money or power out of it.
But that did lead him to attending the Universitas Magistrorum, and later becoming a professor there. (He is a thinly vieled necromancer btw, very interested in death and reanimation but it's a open secret in in the university because he is so bad at hiding it) Don't know yet how he met his wife, but he loves his buff wife.
Emmerich would be either a catalyst or someone like Kaveh who wields something heavier via something else. He would not have a vision, or a moon wheel, and would instead somehow fight with abyssal energy (Or use that abyss magic thing where you use abyss energy to invoke elemental energy like Skirk and Surtalogi do).
And Kaeya's mother, named Aurae, is not from Khaenri'ah. Don't know what she is yet, but she is definitely not human or really has a home nation. If I had to say one she was most attached to it would be Mondstadt.
Aurae would probably be a creation of Celestia or somehow connected to it but she fucking hates Celestia. Anyway this girlie is not human. She has been alive for a really long time, even before Khaenri'ah.
She is around the same height as Capitano and Varka, and just as buff. She would wear heavier, or maybe more menacing and more spiky, armor and would def look like a guy (and commonly mistaken as one) but this unbothered queen does not care. She finds it funny.
Aurae would not have a vision, but instead just have built in anemo powers? Why anemo, idk just felt like it. She would wield a (rather beefy) polearm.
Kaeya would be around 6-7 when Khaenri'ah fell, but again due to his parents he remained in a stasis for those 500-ish years.
During those 500 years his parents suffered pretty bad abyssal corruption to keep him alive. Emmerich has it pretty bad on his limbs and has lost all feeling in them, and Aurae's face was mutualized, making her esstionally blind.
In a sense they compliment each other, Emmerich takes up as little space as he can but collects all the information he can with his sight, while Aurae uses as much space as she can to navigate and fight with her limbs.
Anyway the two are a part of whatever small group of Khaenri'ahns are still somewhat humanoid/sentient. Does that mean that they work with the Abyss Order a lot? Yeah.
Emmerich is their pseudo doctor, he's really good at stitching body parts together and imbuing said body parts with enough Abyssal energy to work again. Emphasis on pseudo.
And Aurae is their heavy hitter when they aren't afraid to get things seriously broken, she unfortunately hits everything in her path because she can't tell whats what.
For the like week Kaeya was with his parents before he got sent to Mondstadt there was a lot of arguments of what he should do. His parents argued that he should be free from Khaenri'ahs mistakes and live his own life. But people said he should be a sleeper agent/spy.
Emmerich, or Aurae, never really said anything to Kaeya about it, hoping that he didn't hear those conversations (He did) and would instead just live a normal life.
Neither wanted to leave their kid in Mondstadt, but the abyss is not really the place to raise their kid.
Also extra note: Kaeya looks nothing like his Dad.
Emmerich has black hair and blue eyes, while Aurae had the tan and blue hair and gold eyes.