Some good choices here, and I'll have to borrow a few:
1. Minsc and Boo - comedy value, as well as melee prowess and a good heart.
2. The Waco Kid (Gene Wilder) [http://en.wikipedia.org/wiki/Blazing_Saddles] - nobody can shoot as fast as the Waco Kid, give him a modern gun and he's set, and he's also a good guy (notice the theme so far).
3. This was tough, as there are very few good, powerful and sane wizards around (I'm the skills guy, I can't fight for toffee). Someone mentioned Susan Sto Helit, which was tempting, but I decided to go with the original wizard, Merlin - he's powerful as anything, more level-headed than any other wizard I've seen, and surprisingly hasn't gone crazy evil with his magic powers.