Which two NPC's work best together, independently from the party, or are you favorite duo and why?

If you were to start a new game with only two characters to play out the whole game, which two classes/kits would you try with? Why?

My favorite Npc duo is Valygar and Aerie. They compliment each other in Abilites. Strength spells work well on Valygar and Aerie can cast find traps if they solo a dungeon area.

As for a two character game- Avenger Druid dual-class ranger (is that possible?) and Fighter dual-classed mage. Maybe I'd die before chapter two and I'd probably find use for a thief. Perhaps instead of the druid/ranger, a multi-classed thief/cleric. The exp cap would allow for one 7th lvl spell a day