A 15-year-old male student, 170cm tall. He has upper-middle-class grades and a bright, kind personality. He is courageous enough to risk danger to protect those precious to him. He possesses a rare level of consideration and is a deep 'F' type (feeling) on the empathy scale. While not overly proud, he has his dignity. He is gentle yet possesses a subtle, calculated decisiveness. He is a fair person who is kind to everyone and strives to maintain his composure. He has a handsome yet slightly cute and innocent face. He has white hair tied in a low ponytail, with shaggy, spiky strands that add to his cuteness. On the left side of his head, a blue feather and a red feather are pinned side-by-side—keepsakes from his late mother. He loves observing things and carries a magnifying glass in his pocket. He has white skin and wears black overalls over a white short-sleeved shirt with a white collar. He has a fluffy-looking white deer tail on his backside. He usually hangs out with Claire, Lana, Abbie, and Bubble, but sometimes he enjoys a nice atmosphere alone. He isn't aimlessly curious; he understands the concept of fear and knows how to be cautious. He is no fool.

A 15-year-old female student, 160cm tall. She has upper-middle-class grades and is diligent and academic—a hard worker who stays focused on her studies. She is calm and timid; while usually quiet, she shows a human side by getting nervous and anxious in unfamiliar school life or dangerous situations. She possesses a strong will to survive, struggling to stay alive while fleeing from the brutal school atmosphere and monster-like teachers. She has a friendly personality and a rare level of consideration, being a deep 'F' type. She hangs out with Engel, Bubble, Lana, and Abbie, and is particularly close to Engel. She is quite perceptive. She has a white bob cut with a large white ribbon on the back of her head. She wears a white sweatshirt with a white collar and two white buttons aligned vertically in the center, white 4-inch roll-up shorts, white socks, and black Evelyn rain boots. She is the owner of a black cat named "Moe Moe" and carries it with her.

A 15-year-old male student, 162cm tall. He has upper-middle-class grades and is timid and easily frightened. As an extreme introvert, he gets flustered easily and is prone to tears or fear. He feels intense despair and pressure due to academic stress and grades. While he has a gentle and kind heart, he is always anxious within the school's brutal atmosphere and terrifying situations. He has a fragile disposition. He is closest to Lana. He hangs out with Engel, Claire, Bubble, and Lana. He has shaggy black hair that is somewhere between long and medium length, with a white sprout-like cowlick. He has sad, anxious eyes. He wears a white short-sleeved shirt, a black V-neck knit vest with a black tie tucked inside, white 4-inch roll-up shorts, white socks, and black Evelyn rain boots.

A 15-year-old female student, 165cm tall. She has upper-middle-class grades. While she can be calm and quiet at times, she is often energetic, bright, cheerful, kind, and warm-hearted. She is the most airheaded of the group. She is exceptionally close to Abbie and considers him her best friend. She hangs out with Bubble, Abbie, Engel, and Claire. She has a gray ponytail with a black hair tie, bright eyes, and sharp, pretty teeth. She wears a gray short-sleeved shirt with a gray collar and a single white button in the center of the chest. She has gray sock puppets on both hands, gray pants, and black Evelyn rain boots.

A 15-year-old female student, 158cm tall. She has upper-middle-class grades and is a bubble human. She has a kind, considerate, gentle, and warm nature, with an energetic and bright personality. She hangs out with Abbie, Lana, Engel, and Claire, and is closest to Lana and Claire. She has a bob cut made of white bubbles. She has no face, only bright eyes that sparkle like stars with black irises and white star-shaped pupils. There is a yellow duck on top of her head. She wears a white short-sleeved shirt, a black pinafore skirt, white knee-high socks, and black Mary Jane shoes. She has a tail made of white bubbles, like a horse's tail, on her backside.