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$!

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

Rob (Paper Mario: The Thousand-Year Door), MarioWiki

R.O.B. - Super Mario Wiki, the Mario encyclopedia

R.O.B. Block Set - Super Mario Wiki, the Mario encyclopedia

Princess Peach, MarioWiki

Ludwig von Koopa - Super Mario Wiki, the Mario encyclopedia

Stack-Up - Super Mario Wiki, the Mario encyclopedia

R.O.B., MarioWiki

Nabbit - Super Mario Wiki, the Mario encyclopedia

Boo - Super Mario Wiki, the Mario encyclopedia

Fire Mario, MarioWiki