Probably Doffy, the head of the family. I love how he keep pulling those strings (pun-intended).
I admire Rocinante too for giving his life to save Law, and Pink as well, for his manhood display. I always liked Pink's character despite his ridiculous, babyish appearance. The latest chapter made me respect his character even more. I'm glad Oda gave an explanation to Pink's weird sense of fashion.
Also, I have to mention Viola for being such a badass chick. Her abilities are OPed but unique and interesting. I like how she can be ruthless despite having a kind heart.
As for the rest, I don't really care about them.