My favourites are Luffy/Zoro(can't choose between) then Ussop right after.
I began to like Ussop during the last arc, you gotta love his immunity to a certain thing XD, and his last solo battle was just ownage.

Sanji, Nami and Robin are great but not close to the first 3

I've never really liked Chopper or Franky, I find em annoying especially Franky

and as for Brook, I hope he leave, he's weak and has a boring fighting style and he has that promise to fufill, so he'll most likely leave

Zoro's the only one I like. Well, at until someone who can weild four swords joins. That would be awesome!

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Glados is a bitch. She made me kill the companion cube, the only friend I'll ever have. :cry:

Chibidoro-sama=Neko-freak

I like Luffy the most since he's probably the type of characters I like most. Kinda reminds me of Gon from HxH and Goku from DBZ.

Second for my would have to be Ussop, he's just hilarious.

Roronoa is 3rd

Nico, Nami, Chopper, Sanji tie for fourth

Franky is last since I haven't seen too much of him, he also beat up my second favorite character.