In one of my home campaigns, my friend Mac and I switch off DM duties. When I am not running the game, I play a Tiefling Bard named Kismet - I consider him my "main." I love him to pieces, and he is so much fun to roleplay. He's grandiloquent, sometimes to the point of foppishness, but there is a darkness lurking just beneath his polished surface. Kismet's back story can be found on our Obsidian Portal site (link).
Currently (while I'm DMing), Kismet is on a solitary journey through the Kadagast Mountains, in search of the ruins of Bael Turath - the tiefling empire - exploring his heritage. His adventures bring him into contact with other teifling pilgrims, and for the first time he is surrounded by his own people. A lifetime as outcasts has made many of them bitter, and their suffering affects Kismet greatly. He begins to think that life might not be an epic adventure, and a seed of misanthropy enters his heart (setting up for his Cunning Prevaricator paragon path).
At the same time, his nobility and romanticism wins him a special place in his new friends' hearts. While his own lineage has been lost to the ages, he records the histories of everyone he meets, building them into a enormous compendium. Kismet being Kismet, he sets most of the stories to song - inadvertantly beginning an oral tradition that preserves and disseminates knowledge about the tiefling race that was all but lost after the fall of Bael Turath.
Eventually, he will become a household name wherever tieflings meet - Kith and Kin Kismet, since he wants to know all about your kith and kin (setting up for his Heir to the Empire epic destiny). A few even go so far to send him letters with their family stories, with requests that he pen another ballad in their honor. These usually end up being forwarded back to his home, the old library where he grew up. His mother is touched at his interest in this heritage, and the head librarian is surprised and proud at his thirst for knowledge. Both feel certain that Kismet is destined for great things.