R.O.B.

Robotic Operating Buddy, a.k.a. R.O.B. is a Nintendo Entertainment System accessory used for playing certain video games. It first appeared as a playable character in Mario Kart DS for the Nintendo DS. It is one of the heaviest characters, only comparing to Bowser in weight. R.O.B. has two original karts: the ROB-BLS and the ROB-LGS. These karts are fast, heavy, and have wider handling.

R.O.B. also appears in the WarioWare, Inc. video games. His first appearance was in a microgame called "Stack-Up" WarioWare, Inc.: Mega Microgame$ for the Game Boy Advance in 9-Volt's level, and later appeared in WarioWare: Smooth Moves for the Wii, R.O.B. is the first boss of the Star Fox boss level.