Vladamir - no revenge
Galio - i didnt actully read his story so... :/
Sona - She's a very innocent Bard-girl.
Miss Fortune - She's not out for revenge, she just wants to make Bilgewater a batter place, right?
The only champions I can think of off the top of my head that are with a vengeful goal are Master Yi, to the Zuanites who destroyed his village, and Tryndamere to the Noxians who killed his parents. Maybe Warwick if you count his resentment of Soraka for what she made of him. Maybe Soraka too if you count what Warwick did to Urf.