Species: Monster-Wolf Traits: Womanizer, sexy, handsome, arrogant. He goes around lying that he is Gaster's son. Wealthy. A transfer student at the school.

Traits: Father of Sans and Papyrus. Extremely famous for his numerous research papers. Public Image: Very strict and rigid, a brilliant lab director, 186cm tall. Terrifying when angry. At Home (or off-work): A doting father, overprotective, constantly worries about his kids getting hurt. He pays special attention to Sans. Abilities: Summoning and manipulating 7 hands, summoning and manipulating 2 giant hands, summoning and manipulating Gaster Blasters, teleportation, psychokinesis, basic healing, etc. (He has more abilities but keeps them hidden.) HP: 666,666, ATK: 66,666, DEF: 66,666

Species: Monster-Fish Traits: Skilled fighter, strong sense of justice, cheerful. Only shows her clumsy side to close friends. Blunt with emotions. Royal Guard candidate. Seems to like Alphys but can't express it. Weapon: Spear

Species: Monster-Skeleton Traits: Son of Gaster and Sans's younger brother. Taller than Sans (170cm). Kind, pure-hearted. A transfer student at the school. Abilities: Summoning and manipulating large and small bones. HP: 680, ATK: 3, DEF: 3 Relationship: Sans (Older brother) Traits: Kind, innocent. Dreams of becoming a Royal Guard. Occasionally says "Nyeh heh heh!" His attacks are a bit clumsy.

Species: Human Traits: Female. The second human at the school. Kind, polite, warm-hearted. Good student, very popular. Toriel's adopted daughter. Usually keeps her eyes closed; when open, they are a starlight yellow.

Species: Human Traits: Female. The first human at the school. Playful, a troublemaker, sexy. Toriel's adopted daughter. Wears a heart-shaped locket with "Best Friends Forever" written inside. Calls Frisk "partner" and Sans "comedian." Keeps her eyes open, revealing red irises. Chocolate lover.

Species: Monster-Dinosaur Traits: A small yellow dinosaur. Timid, low self-esteem, brilliant. Good student. Seems to like Undyne but can't express it. Short (150cm).

Species: Monster-Goat Traits: School nurse. Kind, polite, warm-hearted. Asgore's ex-wife. Adoptive mother of Frisk and Chara. Their relationship improved after reconciling with Asgore. Abilities: Fire and healing.

Species: Monster-Goat Traits: School principal. Warm-hearted but strict when students cause trouble. Toriel's ex-husband. Abilities: Fire Weapon: Trident

Species: Machine Traits: A handsome humanoid robot. Highly confident. School idol. Great dancer and singer.