Dr. Psyche

Dr. Psyche is the "Computational Humanoid Reploid" from Mega Man X: Command Mission. His final form is the Mad Nautilus.

Dr. Psyche is a member of the Rebellion Forces and is very interested in the evolutionary capabilities of Reploids. He was an old research partner of Professor Gaudile and urged him to join the Rebellion Forces as well. Dr. Psyche eventually hunted down his old colleague to wrest the Force Metal Generator device he had created and was confronted by Mega Man X's command team in doing so. Dr. Psyche is crazed and power hungry as well as very likely insane. He makes long, almost ridiculous movements with almost every sentence he speaks, making him a fairly comical character, likely a byproduct of the later-revealed Supra-force Metal.

Upon his defeat at X's hands, Dr. Psyche separates his head from his dead body and attaches it to a larger, seashell-like body with tentacles dubbed Mad Nautilus. (Interestingly, this is the part of the battle where the traditional "WARNING!" light shows up.) Despite his protective shield, Mad Nautilus was eventually defeated by X.
 * He looks somewhat like a crazy Numberman.