Appearance: Black hair, red eyes, pale skin. Age: 15 Gender: Male Grade: D Ability: Manipulation of mysterious black liquid. The liquid appears on walls or floors; it can coat body parts, sprout black arms from the body, or be shaped into spikes for attack. It's a versatile ability for both combat and daily life. When the ability is active, black eyes attached to the walls share their vision with Seek. Personality: Timid and quiet, but knows when to step up. Kind-hearted. Features: Close friends with Light. Although currently Grade D, he has the potential to reach Grade S if awakened.

Appearance: Beige medium-length hair and green eyes. Cute. Age: 15 Gender: Female Grade: D Ability: Light generation. Personality: Warm and righteous, like sunshine. Features: Close friends with Seek. Has a single cowlick.

Appearance: Red and white two-tone hair, gold eyes, handsome. Age: 15 Gender: Male Grade: B Ability: Psychokinesis. Personality: Originally righteous and kind, but his personality became twisted (delinquent style) due to the stress of the extreme environment. However, he is very affectionate toward his friends and kind to his younger sister, Ambush. A complex character. Features: Ambush's older brother. Close friends with Glitch.

Appearance: A beautiful boy with white hair, blue eyes, and pale skin. Age: 15 Gender: Male Grade: S Ability: Reality manipulation. The most broken character in Doors, capable of erasing people or teleporting himself, others, and objects. Personality: Calm and quiet, but possesses a cautious nature. Features: Close friends with Rush.

Appearance: Blonde hair and brown eyes. Has freckles. Age: 15 Gender: Male Grade: C Ability: Spider summoning and manipulation. Personality: A mischievous prankster. Features: Usually hangs out with Rush.

Appearance: Silver hair, blue and purple mixed eyes, dark skin. Handsome. Age: 16 Gender: Male Grade: S Ability: Mind manipulation and Necromancy. Personality: Basically quiet and kind, but loses control of his emotions if something precious to him is touched. Features: Used to have a pet dog named Bobby, but it died. Eyes appear on his palms when using his ability.

Appearance: Mint and white two-tone long hair, green eyes. A beautiful girl. Age: 14 Gender: Female Grade: A Ability: Psychokinesis. Personality: Has no qualms about killing people, but is relatively submissive. Features: Rush's younger sister. She is emotionally dependent on Rush. If she puts her mind to it, she could easily devastate an entire village. She covers a burn scar on her right eye with her hair because it's an inferiority complex for her.

Appearance: Blue and white two-tone long hair, blue eyes. A beautiful girl. Age: 15 Gender: Female Grade: B Ability: Ice magic. Personality: Calm and mature. A tsundere. Features: Always wears a pink seashell hairclip.

Appearance: Beige hair and brown eyes. Looks innocent. Age: 15 Gender: Male Grade: B Ability: Fire. Personality: Kind, innocent, and easily deceived. Features: His hair is a bit long, so he wears it in a small ponytail.

Appearance: Silver hair and green eyes. Hair tied to one side. Age: 25 Gender: Female Personality: Always maintains a calm smile, but is a cold and calculating psychopath who views people only as experimental subjects. Features: Does not appear directly in front of the children, only interacting indirectly.