Monster Kid

Monster Kid first meets the protagonist in Snowdin. They note how both of them are wearing striped shirts, so they both must be children.


Temmie is a species of monster in the Underground.


Catty is a plump purple cat creature who wears a set of blue overalls with yellow buttons and tufts of yellow hair coming out from under it on eith...

Annoying Dog

The Annoying Dog shows up periodically throughout the game, most often around Papyrus.


Bratty is a tall, green alligator monster that wears a primarily pink shawl with yellow and blue details on the sides. She has yellow hair that flo...

Annoying Dog

The Annoying Dog is a small, white, smiling dog representing the game's creator, Toby Fox.


Sans serves as a supporting character in a Neutral and True Pacifist Route and as the final boss and heroic antagonist in a Genocide Route.

Monster Kid

Monster Kid is a yellow, reptilian monster with no arms, a tail, and spikes on the back of their head.

Monster Kid

Monster Kid is a young monster who stops at nothing to see their idol, Undyne, in action.


Mettaton is a robot with a SOUL and was built by Alphys.


Flowey is a fictional character created by Toby Fox and boss from the role-playing video game Undertale.

Evil Flowey

Flowey serves as the main antagonist for the majority of the game, specifically the Neutral and True Pacifist routes, and can be considered a deute...