I'm going to piss a lot of Zoro fanboys off when I say this, but I'm too tired to care:
I think it would be cool to see King and Queen tag team Sanji and Zoro. Their relationship reminds me of Sanji and Zoro's with the back and forth banter, but I'd like to see what happens when they try to fight together. Would they actually be able to put their squabbling aside in order to stop the SH's? Or would they just piss each other off and feel like the other is just getting in their way?
Meanwhile, Zoro and Sanji could come up with some crazy combo attacks, with Sanji's gepo ability and Zoro's swordsman skills. It'd also be a cool callback to Little Garden.