The NES Mega Man games all have pretty much the same basic sound effects. Unless there are specific sound effects you want, the Mega Man 3 pack should do just fine for general-purpose Mega Man stuff.
Everyone else: I'm not promising anything, but I'll see what I can do. Expect Zelda sounds first.
I mean like Airman's tornado attack, or charging up Heatman's weapon.
Edit:Forget what I said I confused this sound pack with another/