We're still early enough in that I wouldn't mind taking an extra writer/character into the fold. But the concept would have to set the character apart from what we already have. Some redundancy is to be expected, but not a considerable amount. Just keep that in mind.

EDIT: and to go with that, I'll want to approve some kind of character sheet before you join (don't really care about format). I just want to make sure your character concept will gel.