Isoc

Isoc is an enigmatic character from Mega Man X6. He first appears after the intro stage, warning the populace of the threat of the Zero Nightmare, and encouraging Reploids to join in the cause to obliterate the new virus. In reality, however, Isoc is actually working as a subordinate of Gate, the scientist responsible for the Nightmares.

Like Serges in Mega Man X2, there is a prominent theory that Isoc is a robotic form of Dr. Wily. This is made evident in the video sequence after Zero defeats High Max. Isoc watches Zero destroy High Max, laughing uncontrollably. When Zero asks why he is laughing, Isoc responds that he cannot help it after seeing how powerful Zero has become, pointing out that while X could not defeat High Max, Zero has done so easily. Zero then tries to attack Isoc, when Isoc raises his hand, nonchalantly generating a force field that immobilizes Zero, and promises to capture him later. Alia notes that Isoc would have to have a detailed understanding of Zero's design in order to create such a field. In X's version of this video, Isoc swears to personally destroy that "ancient piece of junk" later, indicating an irrational hatred of X. X then listens to his friends and makes a tactical retreat.

Isoc is not seen again until a video sequence after Gate is defeated. The player character finds Isoc's body on the ground, and a slightly different scene plays out for each. If X defeated Gate, Alia informs him that Isoc's body is still functional, though he appears to be an empty shell similar to the Erasure incident in Mega Man Xtreme 2. If Zero defeated Gate, Zero hears a voice coming from Gate's body similar to what was believed to be "Wily's" voice in Mega Man X5 (telling him to awaken as a Maverick), telling Zero to do what he has to do and saying he believes Zero is the strongest robot (not reploid). Whichever happens, the character realizes they have no time to check up on Isoc, and he immediately leaves to go after Sigma. Isoc is not seen for the rest of the game, and his fate is unknown.

Sigma revealed in Mega Man X5 that Dr. Wily was still alive in some form, and both Isoc looks physically similar to Dr. Wily and is shown to understand Zero's design and body. However, it should be noted that Isoc was pleasantly surprised to see Zero alive in the cutscene viewed after he defeats High Max, meaning that if he is Wily, then he is seemingly not the one who mysteriously repaired Zero.