In my opinion,
First group; Usopp(funniest character ever), Sanji(i like the way he harrasses), Franky(one word; hentai
.
Second; Luffy(personality and power) ,Chopper(naive), Zoro(charisma) .
Third ; Nami( breast ), Robin( mini skirt), Brook(musician)
i voted for Usopp (Sogekinguuuu)