Personality & Habits
Unlike his partner Gaster, Groober is a silent person, only speaking when prompted. He does not come up with the schemes he does with Gaster and goes along with him even though he does not always understand him.
He is a tabby cat that is first seen in Episode 2, when Gaster is watching Paula, Katy and Sunny eat ice cream. He imagines himself with ice cream, then Groober appears and takes it away, with Gaster chasing him.