Monkey. D. Luffy.
One of my favorite characters in anything ever. Mostly for the way he treats every person as an equal without even thinking, and always stands up for his convictions no matter the cost. Plus he's had so many bad ass moments that make One Piece such an epic series to read.
Sakata Gintoki from Gintama is a close second, for very similar reasons, in how he treats and connects with other characters. Plus...all the awesome speeches.