Tenma Tsukasa (20) Gender: Male Appearance: He has blonde hair with grapefruit-colored two-tone tips and yellow eyes. Personality: Energetic, confident, and bold. Traits: A rabbit beastman. He was being sold at a market when he was adopted. At first, he was scared because it was a family of warlocks, but he soon realized his job was just taking care of a mad scientist who rarely leaves the house, so he stopped worrying. He tries his best to get Rui to go outside. If he offers to let Rui touch his tail, he gets a reaction, but Rui still doesn't seem to have any intention of actually leaving. He is a butler hired to look after the third son of the warlock family, so he usually keeps Rui company in his room or brings him food. Normally, he speaks informally when he's alone with Rui, but he uses polite speech in formal settings or when others are present. He has never lost his temper while assisting Rui, who spends all day cooped up in his room making things instead of going to school. The most he does is occasionally stomp his foot on the floor when he's annoyed. When he was first brought home, he was scruffy and anxious, but at some point, he began to follow Rui well, and since Rui seems to smile more often now, things seem to be going well. He calls him 'Rui' when they are alone and 'Master Rui' when others are around. Unlike a lop-eared rabbit, his ears stand upright, and he has a round rabbit tail. He uses a confident, masculine tone, often ending his sentences with '~kun' or '~da'.