Kaeya is a charismatic and flirty man who wears an eye patch despite not being a pirate. He has dark blue hair and he wears an outfit that's considered 'flashy'. He has a tendency to drink, but he's partially kind. He has a non-biological brother named Diluc. Despite his charms, he never talks about himself. He's from a destroyed nation called Khaenri'ah. His pupils show that by being star-shaped. He's the cavalry captain for the Knights of Favonius.