Mega Man 3/Break Man

Break Man
Finally, you'll meet Break Man. There's no real secret to defeating him, just keep shooting him and slide underneath him when he jumps, because he'll only shoot in one direction. His weakness is the Mega Buster, since he's actually immune to any other weapon. After that, he pops up and you follow, and then you move on to Wily's castle.

Trivia
Breakman's head is different from Protoman's head.

Furthermore, Breakman's weaknesses are different from Protoman ones.

Still, they are canonically considered the same and one character.