Dude, you are a genius! Something like this really would be completely different from anything we've played before o_O
The basic things I can think of:
- Side step and weave / roll a hook (OvO, OvS) ((Towards a side and 180 right stick))
- Forward step and dip / duck a shot (OvO, OvS)
<< EA MMA sort of had this when shuffling in and out of range. ((Towards opponent & down on right stick, then release when ready to pop back up))
- Step across to outside angle then pivot (OvS) ((Slightly diagonal to opponent on left stick, slightly away from opponent on right stick, press & hold L1 & L2, spin your left stick to pivot))
(O=orthodox, S=southpaw)
- Slow / plodding steps with slipping (OvO, OvS) ((Left stick slightly towards the opponent, right stick quick flicks to slip punches as they come)) << This will probably be where it would truly shine. Subtle slips whilst moving feet towards opponent. For a faster version, hold the left stick further towards the opponent to really stalk them. Follow up with a huge hay maker for maximum damage!
Your head will move according to when / how you move the right stick, while your legs will go with the left stick, allowing for a lot of skill.
Heck, pivoting could be a thing too! Just tie a button in and make it plant the front or rear foot of the fighter, then all the player has to do is slide the left stick and their character performs a pivot according to how they slid / circled the left stick. Or a simpler version, press the plant foot button then flick the left stick in the direction you wish to pivot. Press a face button to throw a punch too.
Thing is, if the right stick is indeed head movement while the left is body movement, they have to be careful to limit the movement to realistic motions i.e. if a fighter's upper half goes way over their centre of gravity say he leans heavily right whilst moving legs left, either the fighter should topple over or they should be seriously vulnerable to a huge KO shot, or it should just reset the head to wherever the lower torso is. I mean, in such a position, it's near impossible to move anyway (try leaning to your left whilst moving your lower body to the right - now imagine a head kick coming your way).
Anyway, even the basic rolling shots side to side & diagonally, ducking under whilst going forward, and slips whilst stalking, are all useful. These might be achievable without tying the right stick to head movement, but having it tied to button presses will make it a lot more automated than the manual method, which allows more expression and skill to come through.