I was thinking about this as well. I would love to have a solo player that I could go adventuring on without screwing up my position with my 'co-op' character with my friend. However, my concern with that would be that people would exploit it and have multiple characters in the same spot on the map waiting to log in and kill the person that just killed them. "Scumbaggery" would become a more difficult thing to manage I think. Perhaps make it so that you can't use multiple characters on the same server? Create extra characters that are bound to a specific server? Just some thoughts. ^^