since I got OPGB in april i learned a few things like how to charge luffy's moves. Gum Gum Axe: do luffy's super move [L1/L2+X X] and hold X THIS IS GOOD IN STORY MODE just hold till they come to ya!Gum Gum double barrel:[X+X+O]its sorta good but why charge when they'll walk behind you and beat the crap out of you just hold O for this if you hold it too long it will release Rolonoa Zoro:his is easy to discover just hold R1+O note: watch out for long range attacks,boxes,etc. while doing the Axe

To tell you the truth, you can rotate your character when they are charging, like Luffy's DOuble Barrel and Zolo's Onigiri, FYI/BTW/ETC.