Captain Archer. He was by far the most human of the captains: he had to overcome prejudice, accept unappealing truths, and do things he never thought he's be capable of doing.
The others are all great, but they all seem to live in an era where mankind has overcome many of its bad qualities; whereas with Archer we got to see him actually doing it.
T'Pol with her buttercup in the decontamination chamber.
...using her buttcup in the decontamination chamber.
Good acting. I can still remember every scene... ...of T'Pol and her buttercup...
ENT:Reed
TOS:Scotty
TNG:O'Brien, Picard and Data
DS9:The Sisko! O'Brien, and Bashir
Voy:The Doctor
Hmmm, if we're going by series then...
TOS: Spock
TNG: Data
DS9: Quark (I never get tired re-watching "the House of Quark" a zillion times!)
Voy: The Doctor
Ent: Shran. His quote to Soval "Lets drink! To our mutual DIS-satisfaction!" had me loling