S/He broke societal laws that serve no purpose and tried to demolish a few castles after they were prevented from living as a hermit. They're into the whole Anarchy/Total Freedom scene. Oh, and they also have tastes that are most distasteful to the other people of Tamriel, they experiment a lot. But I have to admit it was a bad idea to try necrophilia in Mournhold. How did they get arrested in Skyrim, you ask? Well after fleeing Morrowind, they had a bit much to drink. Accidentally burped their first Dragon Shout and killed the whole tavern. Was so shocked they didn't think to run from the guard.