Zero was created by Dr. Albert Wily sometime in the early twenty-first century. Wily alluded to him during Bass's ending in Mega Man: The Power Battle, where he mentioned he was developing a robot that would blow away both Mega Man and Bass.

Did Zero kill Dr Wily?

Another big thing to notice — Dr. Wily died “at the same time” as he completed Zero, and his virus, which was incomplete, assisted in turning Zero to the good side.

Who made Zero in Mega Man?

Zero was created by designer Keiji Inafune when he was told to recreate Mega Man for a new series on the Super NES, Mega Man X. He wanted to design a Mega Man different from the original one.