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Some brilliant options you've posted. I really love this thread. It hasn't been done before and there's potential for a lot of fun.
I kinda hope someone else makes the choice about which one they want to write. I honestly can't choose! Sort of why I left it there rather than writing more.
My ideas:
Kasumi: sadist (that's so not her that it has possibilities)
Nabiki: hooker (she loves money so much, well here's a fast way to make some)
Akane: closet lesbian (everyone knows she's a lesbian, but she constantly denies it and sleeps with every guy she meets just to disprove the rumors... yet she utterly fails at it since she's so bad an actor that everyone realizes she fakes her orgasms. At night she secretly faps to Playboy)
Soun: Pimp daddy and has the hots for female Ranma.
Please don't go with those suggestions. They're cliche, friggin' boring, and play to stupid fanon stereotypes. Especially Akane as a lesbian who screws tons of guys, which just seems to be going out of its way to degrade her. It even needlessly mocks her as an actor too, just to dig that knife in there a little further.
Actually, who says people have to shift in the same way every time they're near the curse? Wouldn't that be more in line with being a porn star if scenarios are constantly changing?
[Remainder of comment removed because it crossed a line.]
Lumitiel, I've enjoyed this thread, and the creative concept...especially given the fairly 'predictable' path most of the addventure anime fanfiction takes. This path started out differently, and your writing is very descriptive and fresh.
That being said, I would try to avoid the predictable options below. My choice, if I were to write it, would be to not enforce a totally out of character set of 'roles' on the Tendo sisters (or anyone) when exposed to Ranma's curse. Instead, I would suggest that they act as they do now...save in a far more sexually open manner, as found in a porno.