Feste said:
I'm with Sally: go forth & try it. It's tough to write original characters without invoking dear Mary Sue, but certainly it can be done; there are any number of precedents in B7 fiction. I think the secret is
to
keep her from being the center of every scene & of everyone's thoughts &
of
everyone's emotional lives.
Don't forget the conjunction: I create fascinating original characters, you self-insert, she Mary-Sues.
-(Y)