There is KoF why not to make One Piece series Skin

GX99212

Well, at least that is my own opinion. By making them as Skins, you probably play them as the hero of the base skin not really like them, IMO.

If I the President of Moonton, I would do the characters as heroes rather than as skins instead... Yeah, difficult, but it shows more effort...

Moonton's specialty is that, but there is one more...  Plagiarism...