Perman

Perman (パーマン, Pāman), by Fujiko Fujio, is a Japanese manga and anime series. The first series was serialized in Shōnen Sunday and other magazines from 1967 to 1968, and the second was serialized in CoroCoro Comic from 1983 to 1986.

Plot
After Mitsuo receives a mask from a retiring superhero, he becomes Paaman.