Grenade Man (グレネードマン Gurenēdoman) is a Robot Master created by Dr. Wily visually designed after a hand grenade (specifically an Mk 2 grenade, or a pineapple bomb), having a similarly textured stomach area, and a headpiece reminiscent of a striker lever. He fights primarily using his Flash Bombs and other such high-explosive weaponry. A special Overdrive system is installed in him, allowing him to move very quickly and to temporarily boost his power.
During the events of Mega Man 8, he was stationed at an ammunition factory somewhere in Argentina, causing havoc with his soldiers and explosive weaponry. His weakness is the Thunder Claw which can reflect Grenade Man's own Flash Bombs back to him while also inflicting good damage towards him as well.
Grenade Man is a sadomasochist who enjoys inflicting and receiving pain, particularly through getting himself caught in the explosions he creates. Even though he's a good and profitable bomber when it comes to the job, his indiscriminate behavior and obsession for sadomasochism usually prevents him from being able to complete his missions effectively. He enjoys the stimulant of both battle and explosions while disliking rationality.