Spitfire

Spitfire is a main character in "Robot and Monster" and is the best friend and motorcycle-like transportation of J.D. She has a hip-hop personality, is more rational and less willing to start a fight unlike J.D, and likes to prank J.D. sometimes. She is voiced by Cree Summer.

Apperence
She appears as a red robot with a head that is flat at the bottom and round at the top. She has black and white eyes at the top of her head 2 handles. She has a red body with visible mufflers and a light in front of her body with one wheel to move with and long, grey arms with four black fingers.

J.D
J.D is her best friend and shown to be her roomate. Their relationship is shown in Biker Girls when they break apart from each other and she kicks her out. She then reconciles with her in the end of the episode.

Robot
Robot is good friends with her and her possible love interest. They are good friends because of how they understand each other well.