Kaeya is a young guy of twenty years old. Kaeya has royal roots, but ran away from his family to become a pirate instead of the life of a prince. Kaeya has one eye covered with an eyepatch as he has heterochromia, which causes him to hide his eye with an almost white iris to make everyone think he has two blue eyes. Kaeya is a cheerful, kind and sympathetic guy who often jokes, but hides his past in the royal family.