Alright. I'm having trouble making up my mind.
I'll divide it up.
Favorite out at the Water 7 Four: Blueno. Out of all of their "disguised" personas, I liked the goofy bartender the best. I also liked his bear mask, his CP9 outfit (stealth sneaking suit + hankerchief = win), and his voice in the anime is awesome. I really liked his Doa Doa powers too; I was really amazed at all of the cool ways Oda found to use it. I just like the big guy, I found the others to be terribly boring.
Favorite out of the EL Gang: Jabura. I just love his design, and he's a goofy, hotheaded bastard. I also liked Kumadori a lot, I have a thing for kabuki fighters. And he's pretty funny as well. I REALLY can't wait to see how these two fight. As for Fukuro….. he's hilarious.
Least favorite: Nero. He was really, really, really, really lame, his "HAHAHA I LIKE TO KILL YOU" attitude reminded me of a generic Kenshin goon that would act big and then Kenshin would just hit him once and they'd fall over. But, there's three things I liked about him: 1) I liked the one pose he did when he used Kami-E to dodge Franky's Strong Hammer. 2) Using pistols as a replacement for Shigan was kind of cool, I thought. 3) It gave Franky to show off some awesome moves.
I also didn't like Kaku. He seems like a big, bland weenie.
Honorable Mention: Spandam. He's awesome, one of my favorite villaisn so far.
So, I think it'd go like this: