The classes I love are the generalists! D&D bards, Final Fantasy Red Mages (especially FFTA, and the first FF. FFXI was okay until those damn staves, and C rate sword usage, and other things, but that's another can of worms.), and so forth. I like being prepared, even though it's not as thorough as a specialist.
Though in games made from Bethesda, I generally go with the flow, and high critical sneak sniper with talents elsewhere, if I'm not outright becoming godly, which I like.
I don't mind being a trickster, or trapster. Turrets, and suppressing fire, and stuff.
Sometimes it gets simple. MOAR DAKKA!!!
Edit:
I'm kinda down to play most anything. Problem is, I hate it when I'm forced to play a class by a game. I.E. Medics, Mages, Ranged fighters (Archers, and gunners), glass semi-cannons, heavy support, and so forth being largely women if women are even available to play as.