Carbon Costume 
Underfell Sans
Underfell Sans is special kind of special, a murder-y kind. He enjoys long walks on the beach and inflicting pain on the human. Being pushed around by his brother Papyrus, this is a given.
Underswap Papyrus
Alphys
In Undertale, Alphys is the scientist who helps Frisk find her way through the Underground. She’s a dinosaur-like monster who loves anime (and Undyne) and she’s very shy and doesn’t have much confidence in herself. She usually wears glasses and a lab coat, but if you wish to cosplay her dating outfit, she wears a black dress with white polka-dots.
Undyne
In Undertale, Undyne is a fish-like monster that leads the Royal Guard. Clad in her full armor, she pursues the protagonist through the entirety of Waterfall, frequently evaded or inadvertently thwarted by the Monster Kid. She has blue scales and a long bright red ponytail. She has red and blue fins on the side of her head, and a pair of sharp yellow protruding teeth. She wears bright red eye shadow and has an eyepatch on her left eye. Her eyes have vertical black pupils and a yellow sclera.
Burgerpants
In Undertale, Burgerpants is an employee at the MTT-Brand Burger Emporium, a fast-food restaurant located inside MTT Resort. He is a 19-year-old orange cat-like monster who wears a small hat with the letter M on it, as a part of his job working for the MTT-Brand Burger Emporium. Burgerpants is a highly stressed-out service employee, who hates his job and his employer.
Chara from Undertale
In Undertale, Chara, also known as the First Human or the Fallen Human, is the first human to ever fall past the Barrier on Mount Ebott into the Underground. This person is who the player names at the start of the game, and not the controllable character who is played throughout the entirety of Undertale. Chara is seen to be wearing a lime and cream colored striped shirt, brown pants and shoes. Compared to Frisk, Chara is of a lighter skin, hair color and has red eyes.
Frisk from Undertale
In Undertale, Frisk is the playable character who attempts to escape the Underground after falling down and return to the Surface. Frisk is the last of the eight humans to fall into the Underground after traveling to Mount Ebott.
Frisk is depicted as a young human child of ambiguous age, gender, and ethnicity who wears a striped light magenta-and-blue shirt, blue shorts, and plain brown shoes, and has medium length straight brown hair, short bangs, and a blank expression.
