I think its been stated that when they implement the god and birth date attributes that they will be allowing people a 1 time change to your allegiances and birth date, if that was true, I think SE might be so kind to let us change or update characters if they implement new ones.

Though, if they make it so you can just pay to change. It might take away from the roleplaying aspect if every week your friend comes up to you and has changed race/gender lol, OMG you had a sex change! omg how did they fit a galka into a taru!