I'll say this for Dr. BB, I like his goatee. I'm sure many other characters in this tournament will soon come to sympathize with his situation by getting kicked to the curb by Ace. (Unless Ace runs into somebody of Whitebeard/Crocodile/Straw Hat stature in the next round's bracket, in which case the tears will flow like a catastrophic dam failure.)
Still, I stand by my vote for Nami. Her and Lola on Thriller Bark was golden. Same with her and Luffy in Norla's belly in Skypeia. Basically, put Nami in a situation where she gets to lie to, cheat, or berate somebody (or just put her within hearing range of Luffy whenever he has a stupid question or reckless aspiration) and she's pretty damn funny.
EDIT: And in the interest of full disclosure, I voted for the Straw Hats in the previous matches, because I really do consider them my favorite characters, with rare exceptions for some of the wackier villains/side characters (Hogback, Magellan, Crocodile, Eneru, Bon Clay). And yeah, I voted for Luffy in Franky vs. Luffy. I am a horrible person, I guess.