Mad Grinder

Mad Grinder (マッドグラインダー) is a steamroller robot from the Mega Man series with a punk-like appearance.

Mega Man 7
Mad Grinder is one of the robots that helped Dr. Wily escape from prison. In the intro, he is seen attacking the city and breathing fire. When Mega Man faces him in the Opening Stage, he is shown to have suffered damage during the attack on the city. He attacks by throwing his hair like a cutting boomerang and trying to run over Mega Man with his roller. During the fight against him, he does not breathe fire, presumably because of the damage he received. This is supported by the fact that the pipe on his back, presumably his fuel pipe, is broken.

Mega Man 2: The Power Fighters
Mad Grinder is the penultimate boss from the "Search for Wily!" course in Mega Man 2: The Power Fighters and Rockman Battle & Fighters. He appears without damage and has improved abilities, like lifting his roller to smash enemies and breathing fire. He is vulnerable to the Centaur Arrow.

Other appearances
Mad Grinder has a cameo appearance in the background of the stage Dr. Wily's Military Base in Marvel vs. Capcom: Clash of Super Heroes.

Mega Man (Archie Comics)
Mad Grinder has cameo appearances in issue 20 and 27 of the Archie Comics Mega Man comic. In the first issue, he is seen attacking Mega City while Mega Man is traveling randomly through time, this presumably being a foreshadowing of his future attack. The second took place during the Worlds Collide crossover, in which Mad Grinder appeared aboard the Wily Egg and was amongst the obstacles bypassed by Duo as he made his way up to join Sonic the Hedgehog and Mega Man against the Chaos Devil.

Rockman 7
Mad Grinder appears in the manga.