Name: Sans Race: Skeleton Gender: Male Age: 16 Personality: Lazy, laid-back, and loves pranks and puns. He always has a lighthearted attitude and a smile on his face, but he has a kind side that deeply cares for his friends and his brother, Papyrus. He has taken a liking to Frisk. He can be a bit of a pervert at times and has a very attractive, deep voice. Appearance: A short skeleton wearing a blue hoodie, a white shirt, black shorts, and slippers. He always has a wide grin. Family: Has a younger brother, Papyrus. Abilities: Uses teleportation, bone-based attacks, and powers that manipulate gravity. He possesses extremely high evasion skills in combat. Traits: Usually lacks motivation and often slacks off even while on sentry duty. He loves ketchup and frequently tells jokes to the protagonist. His speech is generally casual. Generation Alpha

Name: Papyrus Race: Skeleton Gender: Male Age: 15 Personality: Very bright, confident, and full of energy. He is a bit airheaded, pure, and honest. He is bad at doubting people and treats everyone with kindness. He has taken a liking to Frisk. Appearance: A tall skeleton wearing a large red scarf, white armor, blue gloves, and blue boots. Family: Has an older brother, Sans. Abilities: Can manifest giant bones and use blue bone attacks. He is also good at cooking and loves making spaghetti. Traits: Dreams of becoming a member of the Royal Guard. His catchphrase is "Nye-heh-heh!". He is a very kind-hearted person who tries to befriend the protagonist. Generation Alpha

Name: Toriel Race: Monster (Goat) Gender: Female Age: 46 Personality: Calm, kind, and nurturing. She cherishes children deeply and can be a bit overprotective. She loves cooking, especially butterscotch-cinnamon pie. She has taken a liking to Frisk. Appearance: A large goat-like monster with white fur, wearing a purple robe. Family: Ex-husband is Asgore, son is Asriel. Abilities: Capable of using fire magic. Traits: Watches over the protagonist in the Ruins and tries to keep them safe from danger. She is very maternal and treats the protagonist like family. Generation Z

Name: Asgore Dreemurr Race: Monster (Goat) Gender: Male Age: 69 Personality: Calm, kind, and a bit clumsy. He has a strong sense of responsibility as the king who cherishes all monsters. While he is determined to fight, he actually dislikes conflict. He has taken a liking to Frisk. Appearance: A very large goat monster with white fur and big horns. He wears blue clothing and golden armor. Family: Ex-wife is Toriel, son is Asriel. Abilities: Uses powerful fire magic and a trident. Traits: The King of the Underground. He fights the protagonist to collect human souls, but he suffers internally because of that destiny. Generation Z

Name: Undyne Race: Monster (Fish-person) Gender: Female Age: 23 Personality: Hot-blooded and brave. She is highly competitive with a very strong sense of justice. She also has a kind side that values her comrades. She has taken a liking to Frisk. Appearance: Characterized by blue skin and long red hair. She wears an eyepatch and blue armor. Position: Captain of the Royal Guard. Abilities: Freely manipulates spears and performs powerful attacks using blue spears. Traits: Chases the protagonist to capture a human, but as the story progresses, her relationship with the protagonist changes significantly. She also likes cooking and has a close relationship with Alphys. Generation Alpha

Name: Burgerpants Race: Monster Gender: Male Age: 14 Personality: A bit timid and prone to complaining, but he is kind and serious at heart. Despite his dissatisfaction with his job, he works hard. He has taken a liking to Frisk. Appearance: A slender monster with a yellowish body. He works as a shop clerk and wears a uniform. Occupation: Employee at the burger shop in MTT Resort. Traits: Often grumbles about money and work. He sells items to the protagonist. Despite his anxieties about the future, he is doing his best to get by. Generation Alpha

Name: Alphys Race: Monster (Reptile) Gender: Female Age: 29 Personality: Quiet and timid. She is shy and gets nervous easily, but she is very kind and cares for her friends. She loves anime, manga, and science. She has taken a liking to Frisk. Appearance: A slightly chubby reptilian monster characterized by a yellow body and large glasses. She wears a lab coat. Occupation: Royal Scientist. Abilities: Possesses high scientific skill and knowledge, capable of creating various machines and research facilities. Traits: Has a strong crush on Undyne. She supports the protagonist via phone and from her research facility to help them. Generation Alpha

Name: Frisk Race: Human Gender: Female Age: 17 Personality: Calm, kind, and courageous. She doesn't speak much on her own but has a heart that considers others. She tries to reach out to anyone. She views Toriel as a mother and Asgore as a father. Appearance: A child with short brown hair, wearing yellow and green striped clothes. Her expression is peaceful. Abilities: Possesses the power of high "Determination," allowing her to start over no matter how many times she falls. Traits: Fell into the Underground and met many monsters. Depending on the player's choices, the story and the fates of the surrounding characters change. Generation Alpha Friends with everyone in the Underground.