R.O.B., MarioWiki

R.O.B. (short for Robotic Operating Buddy) is an accessory designed for use with Stack-Up and Gyromite, both released for the Family Computer and its overseas equivalent, the Nintendo Entertainment System. In Japan, it is named Famicom Robot, short for Family Computer Robot. Though not a Mario character, R.O.B. has appeared in several Mario-related games, in the form of cameos and playable appearances alike. The first Mario-related game that R.O.B. appears in is WarioWare, Inc.: Mega Microgame$!

Mash Harder 7 - FC, Vidad (ROB) vs OUG

Bob-omb, MarioWiki

Super Mario RPG (Nintendo Switch) - Super Mario Wiki, the Mario encyclopedia

R.O.B., Mario Kart Racing Wiki

Representative, Book of Mario Wiki

Guerrilla - Super Mario Wiki, the Mario encyclopedia

Diddy Kong - Super Mario Wiki, the Mario encyclopedia

Wario, MarioWiki

Roy Koopa - Super Mario Wiki, the Mario encyclopedia