χ-Kai カイ(ロックマン) カイ
Leader of the X-Hunters. 

Long ago when Dr. Wily stole Mega Man’s blueprint from Dr. Light, a prototype was built. However, with the development of Zero moving forward, this prototype was discarded and forgotten. During the formation of the X-Hunters, the robot was discovered and completed by a mysterious man. Unlike the original blueprint, it was given much higher specs than that of Mega Man X, using state-of-the-art technology.
x-kai (mega man)