User blog comment:Yountoryuu/Fishman Island: Antagonistic Fights!/@comment-3097081-20110124004450

Luffy vs. Jones and Caribou (not at the same time, obviously).

Zoro vs. Hyouzou and Zeo (I dunno why but to me Zeo looks like he fits with Zoro and Killer's type).

Sanji vs. Van Der Decken (coz Van Der Decken is harassing the Mermaid Princess).

Franky vs. Dosun.

Chopper vs. Ikaros.

I can't think of an opponent for Daruma. Maybe Sanji, since Daruma looks like a rabid, animalistic unarmed fighter type, that moves really quickly and attacks with claws and teeth, althought I doubt he has claws.

If Marines do show up, Luffy vs. Sentoumaru, Usopp and Nami vs. Pacifistas or other strong marines, Brook and Robin vs. random fodder.