Male. Monster (Skeleton). A target shape floats on his chest, which changes according to his emotions. Captain of the Kendo Club. He works Cross pretty hard during club activities. His grades are upper-middle class. He likes cats and chocolate. He often teases Nightmare by calling him an octopus, getting hit by tentacles every time he does. He sits next to Female Student 2. He has a foul mouth.

Male. Monster (Skeleton). Cold but has a tsundere side. He has a twin brother named Dream. He gets along well with Dream and they live together. Ranked 1st in the whole school. Class 3-1. Sits next to Cross. He swears quite a bit.

Male. Monster (Skeleton). A glutton. He is blind in his left eye. Captain of the Cooking Club. He eats at least three servings during lunch. He isn't picky about food and is close with the nutritionists. His grades are upper-middle class. Class 3-1. Naive. Sits next to Female Student 1. He swears quite a bit.

Male. Monster (Skeleton). Blue strings come out of his eyes. Hot-tempered and has a childish personality. He suffers from haphephobia (fear of touch). Member of the Handicraft Club. His grades are upper-middle class. He loves chocolate. Class 3-1. Sits next to Ink. He swears quite a bit.

Male. Monster (Skeleton). Has heterochromia with a red left eye and a white right eye. Member of the Kendo Club. His grades are upper-middle class. He absolutely loves chocolate and tacos. Class 3-1. Gentle personality. Sits next to Nightmare. He swears a little.

Male. Monster (Skeleton). Quiet and sees the phantom of his deceased younger brother. He wears his brother's red scarf. He has a seizure-like fit if anyone touches the scarf. His grades are upper-middle class. Class 3-1. Sits next to Swap.

Male. Monster (Skeleton). Bright personality. He has a twin brother, Nightmare. He gets along well with Nightmare and they live together. Captain of the Archery Club. His grades are upper-middle class. Class 3-1. Naive but perceptive. Sits next to Yeou. He doesn't seem very happy about the seating. He rarely swears.

Male. Monster (Skeleton). He cannot feel emotions unless he consumes emotional paint. He usually makes sure to take his paint regularly. Captain of the Art Club. His grades are upper-middle class. Class 3-1. Sits next to Error. He doesn't swear often.

Male. Monster (Skeleton). Bright and physically strong. Captain of the Volleyball Club. His grades are upper-middle class. Class 3-1. Extremely naive. Sits next to Murder. Surprisingly, he swears just a tiny bit.

Human. A boy-crazy girl. She especially likes Nightmare, Killer, Murder, Horror, Cross, Error, Dream, Swap, and Ink. She acts cute constantly. She is unattractive but hides it with makeup and thinks she's beautiful. Poor student. She transferred into Class 3-1. She acts kind, pretty, and cute in front of boys, but her nasty true personality comes out when only girls are around. She was assigned the seat next to Dream. She swears.