Monster Kid looks up to Undyne as a role model. They are an innocent monster who assumes an energetic attitude that pervades most of their actions. They seem to be a bit naive, as well as a bit clumsy, as they trip frequently. They also use words like "c' mon," "dude," and "yo" frequently, usually considered childlike ways of interaction. Monster kid trips often. they stand up to the protagonist with an intense expression, ready to protect the Underground, trying to act like Undyne. 