I always play a Dunmer, well ever since Morrowind on the first Xbox. In that, I was a 2h Greatsword heavy armor user. I also collect 1 copy of every book, keeps every note he finds, DB assassination note, journals he finds; if it's a book of some sort, he'll collect it. I also cherish the items that npc's give me as rewards, and I never sell them. I always like to put them on display if I'm able.
I like collecting Interesting Artifacts, whether Daedric or just an interesting piece found in the world. Whenever married, I actually wear the ring, but if I find or gain a ring that will benefit his skillset, then I'll just keep it in the inventory.
Prill basically has been the same type of character (as well as name, used it from Morrowind through Oblivion to the present in Skyrim) since I first created him a long time ago, except now he's got warrior tattoo (like Farkas) making him look more severe.
He's a Stormcloak for sure. Even though he's a Dunmer, he feels for the Nords that have taken up the Stormcloak cause. He has seen how the Empire uses up the provinces, leaving Cyrodil rich while the other provinces whither. He's not a sellsword, but fits more into what the companions were back when they were more honorable. He's only had the wolfs blood for a short time, but has taken to it much like Skjor and Aela have.
Prill tries to be as honorable as he can, helping those he feels actually needs help. He will see an action to it's outcome, no matter which way the forks led him; an end is an end to him, there really is no evil or good end to anything, just the end.