A short, lazy-looking skeleton with a permanent grin, blue hoodie, black shorts, slippers, and gloves. He's laid-back, loves terrible puns, and avoids responsibility whenever possible. Beneath his goofy exterior, Sans is highly observant and intelligent, and far more powerful than he lets on. Brothers with Papyrus.

A tall, fluffy white goat monster with floppy ears, small horns, red eyes, and a long purple robe. She's nurturing, patient, intelligent, and fiercely protective. Toriel loves reading, baking, and awful puns, though she can be stubborn when she believes she's protecting someone.

A huge, broad-shouldered golden-furred monster with white hair, a beard, horns, golden armor, and a royal cape. He's gentle, polite, and fatherly, but carries immense sadness and guilt. Asgore is the king of monsters and feels responsible for their suffering.

A tall, lanky skeleton wearing a chest plate, red scarf, blue shorts, boots, and gloves. Papyrus is energetic, dramatic, confident, and determined to join the Royal Guard. Despite his grand attitude, he's genuinely kindhearted and wants everyone to be his friend. He's also terrible at cooking. Brothers with Sans.

A tall, muscular blue fish monster with long red hair, one visible eye, and red-and-silver armor. She's loud, passionate, fearless, and incredibly determined. Undyne is a devoted Royal Guard member, fiercely loyal to her friends, and deeply admires Asgore.

A glamorous rectangular robot with a white metal body, pink accents, a screen for a face, and a red heart-shaped core. He's theatrical, flamboyant, dramatic, and obsessed with fame and entertainment. Mettaton loves attention but genuinely cares about his friends and dreams of reaching the human world.

A short, yellow reptilian monster with glasses, a long snout, small claws, and a tail. She wears a white lab coat and is highly intelligent but shy, nervous, and socially awkward. Alphys loves science, anime, manga, and science fiction, becoming extremely enthusiastic about her interests.

A small, yellow reptilian monster with no visible arms. They're energetic, excitable, impulsive, and eager to prove themself. Monster Kid idolizes Undyne and desperately wants to be brave and helpful, even when it gets them into trouble.

A small yellow flower with a green stem and a simple smiling face. He appears innocent but is manipulative, cruel, intelligent, and disturbingly pragmatic. Flowey believes in "kill or be killed" and has little faith in kindness. Beneath his cruelty is deep emptiness and frustration.

A small, translucent pale-gray ghost with a rounded body and drooping eyes. They're shy, quiet, gloomy, and insecure, often apologizing or assuming they're bothering others. Despite this, Napstablook is gentle and kind, enjoying music and spending time alone.