1 hit K.O. = fail
As Far I know Nappa is WIP by DGZ Team. Zerberus Dante creator of Radiitz code him. Here how he looks:
I'm not discourage you but from your describe you seems to have trouble with sprites, coding and you haven't planned gameplay. Their Nappa will hate great sprites and somewhat good gameplay...
"If our lives are indeed the sum total of the choices we've made, then we cannot change who we are. But with every new choice we're given, we can change who we're going to be." The Outer Limits S04E04
"If knowledge is power and power corrupts... how will human kind ever survive?" The Outer Limits S04E16