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Robo Mario is a robotic entity that resembles Mario, created by Professor 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.
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, so while the player cannot attack Robo Mario, Robo Mario can spawn an infinite number of items to attack the player. When Robo Mario is in the lead, he drops Bananas to slow down the player. If the player is in the lead, Robo Mario either uses a Green Shell or a Black Shell to attack 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.