Monster Kid (Undertale Film)

Monster Kid is a character in the Undertale 2025 film. He is a young, armless, reptilian monster who stops at nothing to see his idol, Undyne, in action. Throughout the film, it's hinted that Monster Kid may have a crush on Frisk.

Appearance
Monster Kid is a yellow, reptilian monster with no arms, a tail, and spikes on the back of his head. Having no arms and frequently running everywhere, he trips and falls often. He wears a yellow shirt with brown stripes, long brown pants, and brown shoes.

Personality
Monster Kid looks up to Undyne as a role model. He is an innocent monster who assumes an energetic attitude that pervades most of his actions. He seems to be a bit naive, as well as a bit clumsy, as he trips frequently. He also uses words like "c' mon," "dude," and "yo" frequently, usually considered childlike ways of interaction.

Throughout the film, Monster kid makes gestures that hint to him having a crush on Frisk, presumably starting when they sit together and enjoy the view of Asgore's castle. From that point and onwards, he tends to blush when talking to Frisk, and gives her various compliments, and offers her help with various moments, like helping her up a ledge, and standing up for her against Undyne. One line that was scrapped would even have him say "I'd hug you if I had arms!".

Differences from Game Character

 * Monster Kid in the game was originally conceived as male, but was later given an ambiguous gender. However, in the film, he is male once again.
 * In the game, Monster Kid gave no hints to having a crush on Frisk. But in the film, he is given an ambiguous, but very likely, crush on her.
 * In the game, Monster Kid gives up on looking up to Undyne as a role model, and moves onto Papyrus. In the film, whether or not this happens is left unknown.