You know, my friend asked me this same question at school, and I was baffled. Here, though, I have an idea...sort of.
Movement: Nunchuck Analog Attachment
It works best here. After all, the analog has been proven to work great with movement of characters.
Items: Revolution Remote-Controller
This would be revolutionary. Imagine, flicking your controller at an angle and controlling the item's movement precisely. Brilliant, I say. It would add a new touch to the Revo.
Guns: Revolution Remote-Controller
Another great idea. You point the controller at one place on the screen and your character will automatically fire at that spot when you press the button...if they have a gun.
Sword/Spear/Staff/etc.: Revolution Remote-Controller
This would work in a similar way to how people say
LOZ Revo. will work. By stabbing/slashing the controller, the character will do that thing...if they have a weapon. Also, certain motions could activate certain special moves (ex: Spin in hand = Link Spin Attack).
Evasive Maneuvers: Revolution Remote-Controller
Imagine this. By hitting a trigger button and flicking the controller to the side, you can make them do a roll or aerial dodge. This works the same way for sidesteps.
Non-Weapon Attacks: Revolution Remote-Controller
This one was kinda tricky, but I have something. By swinging the controller different ways, your character will strike differently. For example, Mario.
High Stab = punch.
Low Stab = kick.
High + Low Stab = punch, punch, kick combo.
Spin in hand = Mario Tornado.
High Stab + Spin in hand = Super Jump Punch.
See? The possibilities are endless! Well, almost. If I missed anything, let me know.