* The following article or section has content which has neither been confirmed nor denied as canon by creator.
Gaster kid is a white, skeleton with short arms, having short arms and frequently running everywhere, they trip and fall often. they wear a grey sweater.
Gaster Kid looks up to Alphys 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 "sup frequently, usually considered childlike ways of interaction.