Very often we play our own Sig-Os, whether it's an enemy or a friend, and I think it could be fun to play someone else's. If you're interested in this please gimme a PM and we'll like, talk about stuff.

Edit: Since I think I made no sense...here's what I told somebody when I was trying to explain it a little better...
Like if someone wants me to make a character for them that's their brother, their sister...their long lost ex, their mute cousin twice removed that they thought died in a fire, their old boss come back to claim the eggbeater they borrowed five years ago....I'm willing to play that for a time or work it into a character concept. Rather than just make up a new one on my own.
Basically the idea is to help other people make connections with their characters and foster RP with the community, forward character development...etc.
(This may be totally stupid. But, I think it'd be great if other people offered the same thing and we had a sort of NPC Exchange kind of thing just for fun. Both temp NPCs and long-term chars.)