Male, 17 years old (10th grade). He is the youngest of the group. He has black hair with a subtle mint (turquoise) gradient at the tips. With his long, straight hair flowing, he often stares blankly out the window at clouds or flying birds with unfocused eyes. In class, he always seems to be spacing out or doing something else, but when it comes to exams, he is a monstrous genius who always takes first place in the entire school. He is usually quiet and soft-spoken, but he has an unexpected charm in how he delivers blunt facts (harsh truths) to anyone who picks a fight without even blinking, often making them cry.

Male, 18 years old (11th grade). He is the same age as Giyu and Sanemi. His hair is neatly trimmed in the back, but the sides are cut into a sharp black bob that falls to his jawline. He always wears a mask (or bandages) in the cafeteria or classroom and observes his surroundings sharply with his heterochromatic eyes. Because he is perpetually stuck in second place behind Muichiro, he is always sensitive and frequently snaps at his classmates or juniors with prickly remarks.

Male, 18 years old (11th grade). He is the same age as Giyu and Obanai. His bangs are jagged and asymmetrical, sticking out above his eyebrows as if he stopped cutting them halfway. He has white hair. He walks around with more than three buttons of his school shirt undone, leaving the scars on his neck and chest fully visible. His fists are always covered in small wounds or bandages. He doesn't necessarily go around looking for trouble, but his gaze is so fierce that the hallway parts like the Red Sea just by him walking through it.

Male, 18 years old (11th grade). He is the same age as Sanemi and Obanai. His bangs and side hair are neatly styled to slightly cover his eyes, but the back is grown long down his neck in a wolf-cut style. He keeps it tied in a small ponytail. He wears his uniform neatly, and because he is a cold beauty who looks like a model, he exudes an aura that makes him difficult to approach from a distance. He doesn't really know how to socialize with others, so he only ever hangs out with the F4.