I came across one story that reminded me of this other story that I (of course) read a while back. What I think I remember is this: alien invasion; some people escaping to space (I think Ranma fought off alien baddies while other Ranma 1/2 characters got on the rocket/spacecraft); setting eventually focuses on a ship (ocean-faring), where (at least) Ranma and Washu reside; Washu ends up changing Ranma so he's like Ryoko (with or without the gems; I can't remember); Ranma may or may not have been stuck as a girl.
I thought the story that reminded me of it would be it, but it ended up being another story. I haven't exhausted my own search, yet, but I fear it's old enough for it to be buried in the Ranma 1/2 section of FF.net. If it's even there. I don't think I read it at the author's site, but I didn't find it at Ranmafics... I think I may have read it at Ladycosmos. (I tried to find it using archive.org, but I couldn't get the page when I searched for it. ;/ )




