User blog comment:Staw-Hat Luffy/Luffy wants the fruit WTF/@comment-972068-20130328213012/@comment-4605926-20130328214616

They never revealed their identity "officially". It was only after they turned super sayians that 18 unmasked them.

At any rate, I hope it will be a couple of rounds before that. I'm sure it eventually will be revealed, maybe accidentally or maybe due to Luffy's silly behavior in a relatively hilarious scene.