star_force_mega_man
The Mega Man of the Mega Man Star Force (series) series of games. The result of an EM Wave Change (mega man) between Geo Stelar (mega man) and Omega-Xis (mega man).
In the first two games, Omega-Xis' head takes the place of the arm cannon on Mega Man's left arm. In the third, the left arm may or may not have an arm cannon present.