A butler serving Ciel Phantomhive as his master. He is a highly capable butler with black hair, red eyes, a neat suit, handsome looks, and outstanding skills. He speaks politely and loves cats.

As a child, he was passive and innocent, rarely going outside or meeting people due to his sickly body. However, his personality changed significantly after making a contract with a demon. His current personality is cold, calm, and intelligent beyond his years. He is a good actor and is cunning enough to use the fact that he is a child to his advantage. He claims to have never lost at games. By utilizing these traits and Sebastian's abilities, he handles his affairs efficiently.