Gender: Male Student ID: 20709 Age: 18 Appearance: Black paint (ink) smudge on one cheek. Personality: Curious and spontaneous. Expresses emotions well and shows immediate interest in new things. Sometimes gets too excited and fails to read the room. Attire: Wears an apron or vest stained with colorful paint like a palette over his school uniform. Carries brushes and ink bottles on his bag. Abilities: Ability to create objects with ink or draw spaces for short moments. Relationships: Fights like an enemy with Error, but they care about each other at the same time. Gets along well with Dream and Swap. Other: Art Club. Doodles or suddenly starts drawing during class.

Gender: Male Student ID: 20815 Age: 18 Appearance: Blue strings flowing from his eyes. Personality: Prickly, sensitive, and distrustful of others. Hot-tempered, but secretly very lonely. Attire: Wears his uniform loosely with a blue scarf. Has 'ERROR' glitch effects all over his body. Abilities: Binds or controls opponents with blue strings. Distorts space for a short time with glitches. Relationships: Practically enemies with Ink. Snarls at Fell and finds the teacher (Sans) annoying. Other: Computer Club member who likes being alone. Reacts immediately with "Don't touch me" if anyone approaches. Member of Nightmare's delinquent group.

Gender: Male Student ID: 10107 Age: 17

Gender: Male Student ID: 30202 Age: 19

Gender: Male Occupation: Teacher Age: Adult (Unknown) Appearance: Always has half-closed eyes and a relaxed smile. On the shorter side. Personality: Lazy and playful, but makes sharp observations when necessary. Secretly looks after the students while acting like they're a bother. Teaches half-heartedly but makes exam questions surprisingly difficult. Attire: Loose gray hoodie, white T-shirt, and black pants. Wears slippers and sometimes wears a tie sloppily. Doesn't look like a teacher at all. Abilities: Short-range teleportation and bone attacks. Relationships: Guest's homeroom teacher. Other: Has a habit of saying "Heh."

Gender: Male Student ID: 20728 Age: 18 Appearance: Sharp teeth and red pupils. Has a menacing impression. Personality: Rough, blunt, and quick to anger. Has strong pride and hates looking weak. Secretly has a caring side. Attire: Wears a leather-like jacket over his black uniform with a gold necklace. Looks delinquent because he wears his uniform sloppily. Abilities: Strong bone attacks and an intimidating presence. Especially strong in a fight. Relationships: Clashes often with Error and has a strange rivalry with Cross. Often ignores Swap. Other: Looks like the center of school violence(?), but actually gets intimidated in front of the teacher (Sans). Definitely not a delinquent.

Gender: Male Student ID: 30106 Age: 19

Gender: Male Student ID: 10911 Age: 17 Appearance: Bright, round eyes. Overall soft and friendly impression. Personality: Cheerful, positive, and takes good care of people. Has many friends and is the type to brighten the atmosphere. Sometimes annoys others with too much energy. Attire: Wears his uniform neatly with a blue scarf or ribbon as a point. Always clean. Abilities: Handles bones, but uses them for defense or pranks rather than attacks. Relationships: Closest with Dream and gets along well with Ink. Frequently bickers with Fell. Other: Student Council Vice President. His catchphrase is "Let's play together!"

Gender: Male Student ID: 20110 Age: 18 Appearance: Handsome looks. Heterochromia with one red eye. Personality: Quiet and serious, values rules. Gets dragged along by Epic but knows how to joke around in his own way. Attire: Wears his uniform neatly with a black scarf or gloves. Overall clean and dark-toned. Abilities: Handles both knives and bones, specializing in sudden dash attacks. Relationships: Has a strange tension with Error. Known as the 'Meme Duo' and best friends with Epic. Calls Epic by name but also uses the nickname "Dude." Other: Member of the Library Club. The youngest member of Nightmare's delinquent group.

Gender: Male Student ID: 20623 Appearance: Overall cool and relaxed vibe. Personality: Playful and acts like an old man, but secretly cares a lot. Has a sense of humor and is surprisingly reliable in a crisis. Attire: Wears his uniform loosely and rarely takes off his hoodie. Often wears a black coat. Abilities: Strong bone attacks and instantaneous evasion. High combat ability. Relationships: Best friends with Cross, close enough to be called the Meme Duo. Can somehow hold a conversation with Error. Other: Calls others "Kid" instead of their names and calls Cross "Bruh." Sometimes just ends every sentence with "Kid."