TOS: Sulu (Jack-of-all-trades and swashbuckler)
TNG: La Forge (Average guy doing the best he could)
DS9: Worf (I always felt Worf got more interesting when he joined the DS9 cast)
Voyager: Chakotay (Great potential, mostly wasted, but still there)
Enterprise: Reed (Quiet, competent and dangerous)
Excalibur: Calhoun (He appeals to my inner 13-year old and reminds me of a friend's character for FASA from that era)
Former Decipher RPG Net Rep
"Doug, at the keyboard, his fingers bleeding" (with thanks to Moriarti)
In D&D3E, Abyssal is not the language of evil vacuum cleaners.