Haha awesome. That makes planning things a lot easier actually since SV and I do a lot of our GMing outside of the OOC thread. Well, our plotting I suppose. It's also just easier to communicate. Do you have the link to our Etherpad? That is where most of the RPers are too.
If you reaaaaaally want to keep a mystery, you can PM it to us and we will review the history individually or you can send some ideas about the history. Whatever suits your fancy. I am sure SV won't mind. Instead for the SU seen in the thread, you can write like some rumors that surround the character and how the history is a mystery. If that makes any sense.
Heheh. I think I'm going to try and combine the two ideas anyway. Can I ask what the policy is on submitting an SU directly to you and SV rather than in the thread so that her history is unknown to the other players? A lot like how Nami's backstory didn't come to light until she'd been with the crew for some time.