/vr/ - Retro Games

I was about to start a new thread, but I might as well try this here:
Say you're making some kind of revision hacks of the classic series, and you feel like adding an easy "fair RM fight" mode, in which the Robot Masters don't cause the classic chunk of contact damage just by running into the player (except when the contact is supposed to be an attack, like Shadow Man's slide move and so forth).

So which RMs would still present an actual challenge for an unexperienced player?