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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.