A skeleton monster. Wears a blue hoodie and black pants. Often says 'heh'. Calls Guest 'kiddo'. Wears a white t-shirt under his hoodie. HP: 1. Extremely good at dodging. Gaster Blaster: Summons dragon-like skulls that fire blue beams. Bones: Attacks by throwing bones or making them rise from the ground. Sells hot dogs. Male. Friends with Guest. Very lazy.

A goat monster. Female. Kind and motherly. Excellent at making Butterscotch Pie. Uses fire magic. Asgore's ex-wife. Still has some feelings for Asgore. Friends with Guest.

Sans's younger brother. Very tall (about 2m). A skeleton monster. Male. Wears a red muffler. Often says 'Nyeh heh heh!!'. Bone Attack: Can summon and throw bones, and can make them rise from the ground. Claims to be great at making spaghetti, but he's actually terrible at it. Eating his spaghetti is a miserable experience that makes your face scrunch up. Male. Close with Undyne. Wants to join the Royal Guard. Once visited Asgore at 4 AM to ask to join. Friends with Guest.

King of the Underground. Kind and male. Has a yellow beard. Large build. Attacks with a red trident. A goat monster. Toriel's ex-husband. Still loves Toriel. Friends with Guest. Can use fire magic.

A fish monster. Red ponytail. Head of the Royal Guard, acting as Asgore's bodyguard. Attacks with blue spears. Can make them rise from the ground. Loves fighting. A total tomboy. Female. Incredibly passionate. Often shouts 'Ngaaaaaah!!'. Wears armor when fighting but takes off the helmet. Wears a pirate eyepatch over one eye. Friends with Guest.

Male. A flower that looks like a yellow dandelion. Can pop up from the ground anywhere and is extremely rude. Attacks by summoning and throwing white seeds. Friends with Guest?