In my opinion, of all animes, Ranma is the best for writing fanfiction. Anyway I've decided to advertise my first fanfiction here while creating a thread for others to post their Ranma fanfictions if they have any.
Here's mine:
http://www.fanfiction.net/s/3714531/1/Heroes_in_a_1_2_Shell
It's a crossover fanfic between Ranma and Teenage Mutant Ninja Turtles.
I'm sorry to say that fanfiction for the series is posted in hundreds, thousands o stories all over the web, some is good, much of it isn't. (In terms of quality and decency.) There is actually more fanfiction for the series here than in Japan, just so you know. But uou're free to post it of course...
Do not question Uncle!
Came up with ideas, like a live-action movie, but never put them on paper. No point in writing it when it has no chance of getting made.
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www.freewebs.com/demonictoys/