Caim is the brother of Furiae, uncle of Nowe, former friend of Inuart, a Union Soldier, and the former prince of a small kingdom which was destroyed by the dragons in the service of the Empire. He despises dragons for what they did, but when faced with a life or death situation was willing to make a pact with Angelus. The price of the pact was his voice and it left the pact-maker symbol on his tongue.
Caim is known for his bloodlust and vengeful ambition. He lacks empathy, mercy, and displays a great love for battle and slaughter, with a characteristic sadistic grin while in the midst of combat. There are few people that Caim holds dear, namely Furiae and Angelus but those that he dose he will go to great lengths to protect. He is even willing to condemn the world to chaos to end the suffering of Angelus. He eventually accepts his death in order to be with her again.