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Robo Mario is a robotic entity of Mario, created by E. Gadd (as evidenced by the logo on his cap). He first appeared in Mario Kart Arcade GP, then reappeared in Mario Kart Arcade GP 2. Two versions of Robo Mario exist: a black version and a silver version. A discrepancy can be seen between Robo Mario's emblems on his kart; the official artwork shows the kart has E. Gadd's logo, though the model shows it with Mario's logo.
Mario Kart Arcade GP
In Mario Kart Arcade GP, Robo Mario appears in the challenge game in Rainbow Cup, which occurs on Rainbow Coaster. The objective is to beat Robo Mario while dodging his attacks. There are no Item Boxes in this course; the Robo Mario spawns an infinite number of items. When he is in the lead, he drops Bananas on the player. If the player is in the lead, Robo Mario either uses a Banana Shot or a Green Shell to stop his opponent.
Mario Kart Arcade GP 2
Robo Mario reappears in the sequel, Mario Kart Arcade GP 2, having the same role as in its predecessor. He is found on the challenge game taking place on Rainbow Coaster.