Isoc

From MMKB

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.

Isoc, like Serges before him, is also theorized to be Dr. Wily. Although there is much more evidence pointing towards it. Most notably, he also bears a striking resemblance to Wily and claims to know Zero inside out to the point of being able to immobilize him.