A Jaffa with a split personality? Sounds more like a Goa'uld or Tok'ra. Could be good though
. I've been thinking about a Rogue NID character that got split from the Trust after they became Goa'uld. Stranded in hostile territory...with the SGC, Goa'uld and Trust after him.
May start another couple of threads for the story and characters/resources at some point, turn this into a discussion thread.
btw, a good website for stargate fans:
http://www.stargatenovels.com/