Feedback

Feedback is a fanon character; he has yet to encounter Mario.

Story
Feedback, like Mario and Luigi, comes from the real world, but is equipped in a high-tech suit of armor. He first encountered Bowser after he caught the Koopa King trying to break into his secret underground vault, subsequently following him and helping Peach escape several times.

Trivia

 * He is actually in love with Rosalina, but is worried that her responsibilities might get in the way of a relationship with her.