[quote=@The Elvenqueen]That RP specifically even went in a totally different direction to what we had originally planned out, but you know what, it was actually GREAT because we both went "well this is unexpected....ah well, let's just go with it!" And neither of us was forced to act in a way that would be out of character for either of our characters just to suit the other person because we talked about every idea and plot point beforehand and agreed on a final rough "outline" to follow while leaving it open for the other person to edit it a bit if they felt they needed to.[/quote]

This is the best! One of my favorite RP partnerships is the one wherein we both feel comfortable doing character-building on the other person's behalf. My character struck her as being a lazy slob, so when she walked into his apartment she commented on how he needs a maid. Her character struck me as a workaholic trying much too hard to impress everyone, so when RPing my main character I can sometimes do little things to try to calm her down, like bringing her coffee. But when I'm RPing the NPCs (a shared responsibility), especially ones ranked higher than hers, and especially males, they just think she has a good attitude which will get her places in the company, a good excuse to pile up more bitchwork onto her day. So all the characters in the story react to her personality differently, and it's a personality which I helped to develop. She does the same thing, except my character is a loser who is content with mediocrity, so he never goes out of his way to please anyone or to do more work than necessary, so under her command, the NPCs, when they recognize him as their coworker at all, pay him little or no mind. He's not juicy gossip-fodder, after all; worthy neither of partaking in it nor of being its subject.

So we're not necessarily even opposed to other people writing characters for us, but if you do that then you have to be open to your character being altered too; which you probably won't be if you're molding your RP partners to fit your preconceived notions of how the story "should" look, instead of letting us play off your creativity and vice-versa.