Speaking of a dwarf, Peal, that might not be too far off. The little cat fish fishman from the original crew sketch was basically a dwarf. Now that a big fat guy is joining I wouldn't be surprised if we get a little guy who is always small. Unlike Chopper who can grow and shrink as he pleases.
Speaking of that sketch, i'm counting on Oda to release that picture again years from now but with out all the erase marks in the back revealing a big fat early Jinbei with dread locks in his beard.