Kirk was always my favorite character. Sure, I liked Spock, McCoy and all the others well enough, but Kirk was my hero!
I liked LaForge the most, but I always thought Picard was cool...up until the TNG movies where he suddenly turned into Bruce Willis from Die-Hard, that is.
The Sisko. 'Nuff said.
Tuvok was my favorite, but I liked the few times the writers remembered that Janeway and Tuvok had been friends for years.
I actually didn't mind Archer that much and I thought the character went through an evolution from naive boy scout to battle-hardened commander as the series progressed, but I frequently found myself rooting for Mayweather because he got no love from even fans of the show.