Luffy: He's Cute and cuddly and for some reason I just want to hug him. I love his attacks, though I do admit that sometimes his fights can get ridiculous even for a Shounen manga character…(Like his fight with Lucci) his luck also gets on my nerves sometimes... like when he gets out of a situation in the some of the most very unlikely ways. But, anyone who's crazy about food is cool in my book.
Zoro: I guess you can kind of say he's my least favorite, but I still appriciate him for his loyalty and strength as a crew member. Plus, sometimes his fights are awesome (vs Kaku was the best IMO)
Nami: At first I didn't like her, but then I learned more about her character and in time I found her more interesting. In all honesty, I can't find her attractive (I'm not gay) and she can be a bitch... but hey, she's strong willed. Plus, I don't like it when people called her useless... I mean, if she never got sick, chances are they would have not needed a doctor and then have not met Chopper. She also helped in the donut race during the Davy Back Fight, and really knows much about navigation which is necessary to get around on the sea.
Usopp: Didn't care for him much at first, but he grew on me. Seriously, out of all the straw hats, I look foward to his fights the most. I love how he can use his brain or how he always has some sort of trick up his sleeve. Plus, out of all of them he's the most human, making him the most vulnerable, but at the same time makes him more interesting. His fights leave me like "How's he gonna get outta this one?" and then he does something cool. Go Usopp
Sanji: MAIN REASON I GOT INTO ONE PIECE. His personality is great, he's calm, smooth, and sexy (again, I'm not gay) yet at the same time he can be silly and goofy. Only time I didn't like him was when he fought Jyabura, who Usopp was fighting already, so Sanji took over. I admit, Usopp got messed up, but I still felt that Jyabura should have been beaten by Usopp instead of Sanji. I felt Sanji really stole Usopp's thunder there...but I can forgive him.
Chopper: He's cool, though I don't like how his character design changed later on. Not much to say about him other than that though.
Robin: Smooth and sexy, like Sanji, but only she seems much more deadly. I also am a fan of intelligent quiet women since they seem so relaxing to me. Even when killing some one, she does it so elegantly. I just wish she got more of her own fights.
Franky: Oh MAN is this guy cool... Seriously, His character design is the best out of all characters. Only thing I don't like is his voice in the anime and the fact that some of his attacks are predictable (ONLY SOME, not all. Some of them really blow me away, like his pillar-chucks) Plus, I admire a man who's not afraid to cry