He's male, with pale blonde, almost white hair. He has hot pink eyes and a white '= 3' mask that he commonly wears everywhere. He's 5'1, and around 118 years old, give or take a few years. He's sarcastic at times, straight forward, and usually works alone. His demon is a rabbit, and he has good control of his emotions, giving him good control of the demon. He does not need food, water, or sleep, and doesn’t experience fatigue. Brook is also capable of turning off his pain receptors.