I've been interested in playing this character concept for awhile, so I thought I'd throw it out there and see if there are any takers. The game would be fantasy freeform, but based on DnD ideas (although if someone really wanted it to be a d20 based game, I'd be up for that).
My character would be a "Lawful good" paladin sort of character taken captive by some sort of sinister person or persons (sorcerer, demon, what have you--although I prefer them to appear fairly human) and slowly turned to the side of evil. Eventually, it would be nice to then have this character be an ally to the original bad guy and together they would make someone else their slave (another player).
This is just a rough idea of what I want, but I'm open to idea. After all, that's what collaborative storytelling is about. :)