Haha fat, ugly, no boobs XD.
Frankly if we get a girl I'm more thinking of personality, I would like to see a girl with the mindset of Luff/Zoro/Sanji/Franky when it comes to battle and be kinda silly like Luffy/Usopp/Franky/Brook, other traits are pretty much covered by Nami and Robin, hopefully we get a mink out of this arc.
The only girl I though had a shot in the last few years was Marguerite, when I saw Luffy bonding with her, her being unexperienced and different from Nami/Robin, what we have to look at when it comes to crewmembers is how Luffy interacts with that character.