Really.. Characters of Depth and Complexity - Finnegan.
Finnegan!? Jeezus! He has as much depth and complexity as a teacup.
C'mon man. If I thought you were joking, I'd say "Spiffing jape there my good fellow" or something, but this is just lunacy.
Finnegan!.. (I'm shaking my head right now in case you can't visualize it.)
Finnegan is a poignant example of the rigors of youth as during the transition to adulthood, clashing with the independant responsibilities and expectations unique to both stages of life. With this in consideration, Finnegan is indeed one of Trek's most complex characters with the most depth.
I know of no one who can match this level of depth and complexity. Harry Kim and Travis Mayweather come close, but don't quite measure up. I suppose Chief Engineer Argyle from TNG equally as deep and complex, but for completely different reasons.
You forgot Wesley Crusher and Nog.
No, they were camera whores, always taking up screentime. Wesley and countless episodes devoted to him, including three after he left the show. While Nog had that entire episode about him losing his leg, which is clearly a rip-off oof the clearly superior BSG storyline about Gaeta losing his leg. Mind you, Gaeta didn't quite have the depth and complexity of his boyfriend, Lt. Hoshi.