Dr. Crygor

Dr. Crygor is a cyborg mad scientist found in the Wario series who performs wacky and mostly harmless experiments on his private island laboratory. Notable inventions include a potion that induces food-poisioning, a gravity manipulator apparantly made out of a washing machine, and a large, squarish machine that turns apple-cores into apples and Dr. Crygor into even more of a cyborg than before.

His robotic components include a visor with a glowing, red eye, one hand, a metal plate on his head, and one leg. As of yet, it's never explained why Crygor has these robotic replacements, presumably from a debilitating laboratory accident.