This didn't matter. It's a fighting game, so the fundamentals are simple. Pick a funky lookin' dude and fight. Ignorance isn't exactly a barrier to enjoyment in this genre.
Only here it is.
That's because One Piece Burning Blood is the very definition of fan service. If names like Monkey D. Luffy, Trafalgar Law and Roronoa Zoro mean something to you, you'll find a decent enough fighter here. But if they sound like the sort of jumbled nonsense an online random name generator would spit out, best stick to the classics like Tekken or Street Fighter, because there's nothing for you here.
Not being familiar with the source manga or TV anime, I found the whole thing a flashy bewildering mess. The story mode, where I spent most of my time, assumes prior knowledge, so remained incomprehensible.