Robo-suit

A Robo Suit is a robotic full-body suit that can be worn to grant the wearer(s) with numerous abilities. There have been two robo suits that made appearances, both of which appeared during The Super Mario Bros. Super Show! episode "Robo Koopa". Both robo suits were designed by Dr. Nerdnick, although they vary greatly in design and function.

Robo Koopa's suit
The first robo suit built by Dr. Nerdnick was worn by King Koopa. King Koopa somehow convinced Dr. Nerdnick into building it for him, and wore it to wreak havoc on Robo Land, thus attracting the attention of Mario and friends. While wearing the suit, King Koopa went by the alias of Robo Koopa. As Robo Koopa, King Koopa was a seemingly unstoppable force, and came close to defeating Mario. Howver, Dr. Nerdnick and his assistant Bunsen tricked Robo Koopa into triggering the robo suit's ejector seat, thus sending King Koopa flying out of the suit. Dr. Nerdnick later converted this robo suit into a "robo pizza oven."

Plumbinator
The second robo suit, unlike the first, was given an actual name: the Plumbinator. Additionally, it required two operators in order to function. Dr. Nerdnick built it entirely out of spare parts found in a junkyard, thus limiting the suit's full potential as a counter to the more refined Robo Koopa. Wearing the suit, Mario and Luigi challenged Robo Koopa to a duel, but ultimately lost when the suit was destroyed after a large fall.