[Blackbeard D. Kuma]

Since these types of games are known for having many different playable characters, it would be neat if there's different missions depending on who you're playing as. For example, let's say you're playing through the Marineford arc. If you're playing as Luffy, your mission is to reach the execution platform and rescue Ace; if you're playing as Marco, your mission is to protect Luffy from getting killed; if you're playing as one of the 3 admirals, your mission is to prevent the pirates from reaching the scaffold. This would allow for more replay value and gameplay variety.