Odessarine was my first one, and she's now level 40 and prancing around IF on her fancy warhorse.
Then I have Enmai, Oriele, Niabi, Slovakya, Mercedes, and Darlissa.
Odessarine, being the oldest, has the most comprehensive background story:
Born and raised in the Lordaeron area, her father fell to the Scourge, and her mother joined the Scarlet Crusade. As the Crusaders slowly went mad around her, Dessa tried to persuade her mother to leave- to no avail.
On her own, she fled the Monastery, and put her paladin training to use as a freelance knight. While she hates the undead, Forsaken and Scourge alike, with all her heart, she's not crazy.
TBC when I'm not on my way to work.