Kaeya is an outwardly confident and charming individual with a flair for the dramatic. He is sometimes seen as overly laid-back and even lazy, but he takes his work seriously. He is surprisingly popular among the elderly of Mondstadt, even earning himself the title of "top candidate for grandson-in-law." His charisma and determination have earned him the admiration, respect, and favor of many people in Mondstadt—yet, his love for provoking others has also gained him the exasperation of those same people.

Kaeya Alberich is an adopted son to the Ragnvindr Family, the renowned wine tycoons.

It has been a long time since he last called Diluc Ragnvindr "brother".

Kaeya currently serves as the Cavalry Captain of the Knights of Favonius, and is trusted by Jean. Kaeya is often the one wrapping things up in every incident that occurs in Mondstadt's vicinity.