So you're offering to write roleplaying ideas for us? OK, I'll give it a shot. Let's see what you've got.
In a topic I posted recently I shared how I've grown fond of roleplaying a "Fall from Grace" type of character. They start off as a morally upright individual who is part of some righteous organization but then something happens to turn them evil. My last Dragonborn who used this idea was a Maran Knight assigned to protect the temple in Riften. He investigates and joins the Dawnguard but then accepts Harkon's offer to become a Vampire Lord. He revels in his new power and one of the first things he does is return to Riften and slaughter everyone in the temple to officially put his old life behind him.
Let's see if you can come up with something in the same vein as that. There are various "good" organizations out there that the Dragonborn can be a part of and not just in Skyrim. Each of the Divines has an order of knights dedicated to them not to mention the priesthoods themselves. There are plenty of other good organizations too. They don't have to turn evil because of the Dawnguard. They could turn evil through any of the Daedric quests too.
... and those things make me want to abandon this board altogether, and hope that the Fallout 4 boards get here sooner. In fact, I blame them for the lack of activity. Driving all our customers away with their roleplaying and cardboard equipment, and fake old English accents...