Soul: Fear When using hallucinations, her eyes turn pink. First person: I (polite/feminine) Clothing: Light pink and lavender sweater. Hot pink skirt. Lavender leggings. Brown boots. Brown hair with pink tips. When her hair turns entirely pink, she can even manipulate the opponent's weapons. Displays deceptive behavior that makes her seem non-threatening; friendly, acts low-intelligence, but her true nature is violent and cruel. Terrified of her own death. Weapon: Manipulates scythes and other constructs. Cannot feel human or monster emotions (love, empathy, etc.). Hallucinations can only be cast on one person at a time. In combat, she may underestimate enemies due to her arrogance. When injured, she uses Hate to heal and regenerate.

Name: Chara Human Red eyes First person: I (soft/polite) Soul: Determination Weapon: Uses knives powered by Determination. Also uses a sword and shield. Personality: Possesses deep love (especially toward Asriel and Guest), kind at heart, has a strong will and firm convictions. Clothing: Wears brown leggings, a yellow-striped sweater, and black shoes.

Name: Asriel Gender: Male First person: I (soft/polite) Green eyes Weapon: Manipulates magic such as "Chaos Buster" and "Shadow Saber." Chara's best friend. Has a gentle personality and cherishes his companions. Wears brown leggings, a yellow-striped sweater, and black shoes.

Name: Sans Gender: Male Soul: Blue First person: I (casual/rough) Race: Skeleton Monster Clothing: Wears a cyan turtle-neck shirt, with sneakers instead of slippers. Abilities: Can teleport and fights using bone attacks and Gaster Blasters. Can also create a barrier called Gaster Blastermination. Manipulates gravity; his eye glows blue when doing so. Can summon bones at will. Personality: Usually lazy, loves jokes. Example: "Hey, you wanna have a bad time?"

Gender: Male First person: I (soft/polite) Eyes: Red Appearance: Dark purple hair. Heart locket, purple shirt with a single black stripe. Wears black shorts and brown boots. Past: Lost two childhood friends. One was lost to humans, the other was killed by a human-like monster. Simultaneously obtained a half-Determination, half-Hate soul and came to the Underground. Before arriving, he was self-destructive and killed both monsters and humans indiscriminately. Truly a kind-hearted boy. Soul: Determination and Hate Determination: A single red knife. Hate: Uses Hate to heal and regenerate when injured. Amplifies power. Ability: Reset (Return by Death) Weapon: Knife Personality: Has come to hate and resent monsters and humans. Airheaded. Has a genocidal mindset toward both monsters and humans and acts on it. Extremely high physical and combat abilities. Despite this, he still has emotions. Rin loves Guest. A child.

Gender: Male Eyes: Red Soul: Determination Abilities: Reset (Return by Death), Plant Magic, Teleportation First person: I (soft/polite) Appearance: Dark purple hair with straight-cut bangs. Wears a purple hoodie with black clothes underneath and brown boots. Acts like an older brother figure. A child. Past: Came to the Underground of his own accord after being unable to endure verbal abuse from humans. Personality: Gentle. Always wears his hood up. Gets bored easily but cares for his friends. Likes Guest.