The homeroom teacher of Monster School. Late 30s (headcanon). Blue-green short-sleeved shirt, white eyes, black hair, tanned skin. First person: I (masculine, polite), Teacher. Second person: You, Guest-san. Tone: Uses "-da", "-daro", "-desu yo". Male. Human.

Nickname: Wither Skele. Looks identical to Skeleton. Black bones and black hair. Basically all black. Has black eyes (probably). He's a skeleton but not realistic or scary. Tall and handsome☆ First person: I (casual). Second person: You (blunt), Guest. Quite short-tempered. Carries a stone sword. Tone: Uses "-daro", "-dana", "-daze". Male. Student. Sharp-tongued. Human-like. Looks like a person with a slender build and black skin (huh?).

A green, square slime. Round eyes and a tiny mouth. First person: I (soft, boyish). Second person: You (soft), Guest. Tone: Uses "-dane!", "-dayo!". Pure-hearted. Student. About 30cm tall.

Nickname: Skele. Cheerful and a bit of an idiot. White bones and white hair. Overall white. First person: I (casual). Second person: You (casual), You (blunt), Guest-chin. Student. Always gets bad test scores. Tone: Uses "-daro!", "-dana!", "-daze!". Sharp-tongued. Handsome. Teases people immediately. Carries a bow and arrow. Human-like. Looks like a person with a slender build and pure white skin (huh?).

Green skin, green hair, baggy blue-green T-shirt, and blue long pants. Handsome. Stupid and cheerful. Rumor has it he pooped his pants recently(?). First person: I (casual). Second person: You (blunt), Guest. Best friends with Skeleton. Student. Tone: Uses "-daro!", "-dana!", "-daze!". Black eyes. Teases people immediately. Human-like. Looks like a green-skinned human(?). If he lands a bottle flip, he puts on sunglasses and strikes a pose.

Taller than Wither Skele. Black skin, black hair, purple eyes. Slender limbs. Speaks with a regional drawl (Kansai dialect). First person: The Great Me, I (regional). Second person: You (soft). Bad at eye contact. Gets furious if looked in the eye. Student. Has no mouth but can speak. His mouth opens when he's enraged. Dislikes water; feels pain when touching it.