Luffy = Should have more crazy moves once again as he did in the past. Now he just uses the same moves but in G2. Something crazy like Gomu Gomu no baka.
Zoro = Swordbreaking moves ala Ryuuma and a backround behind Ashura
Sanji = A damn long range move. Come on Oda even Nero could to a Rankyaku. Zeff could also put out fire with just an kick in the air. And like with Zoro an explanation for DJ maybe
Franky = He should shoot lasers or something like that. Or fight with some weapons ala Nunchaks more often. That was amazing
Usopp = Well he is very creative so I'm happy with him
Robin = Her ability is so hax she should do other things than just grabs like double punches and kicks
Brook = We have to see more from him
Nami = Not just lightning moves. She should create some very strong ice and fire attacks as well
Chopper = Maybe some mid form of Monster-Chopper which he can control or no time limit. He should be able to make the rumble balls last longer now.