I'm inclined to get involved in this as I've said in the interest check thread.

One thing I think [i]everyone[/i] should be very, very cognisant of is not tying other people's hands. It's best it's said early and often so that it resonates with people. Please try not to tie other people's hands in regards to usable characters unless you really, really have to and be aware that someone else might wish to play a character after you too.

Too often people steam in, fundamentally change a character, and then leave them after a month and it creates problems for other people. Just try to be aware when you make changes and/or expand on your character's history or supporting characters that doing so creates ripples within the game that other people have to observe. Make those ripples sustainable.