One of the Night-Children, made sometime in the twelve century. He won’t say what his original name was, but it sure as heck wasn’t Kai.
Kai is one of twins, vampires – and a most unusual heritage. He and his sister, Elsa, were originally from a royal line, though bastards, lived in Siberia, which is where Notte found them. He’s also Kin – a human whose ancestry includes some magical being – and thus, able to cast spells.
The thing is, Kin can’t be turned.
How Notte managed to successfully make Kai and Elsa into Night-Children is a mystery, even to him; only they and Jonathan, of all the Kin through history, have been successfully Made.
As a result, the heritage of Kai, Elsa, and Jonathan is highly secret.