Well, we don't have a Sailor Sol, and I've done a Jupiter story.  We 

don't have Sailor Asteroid Belt, either...Yet :)<<
Well, someone else decided to rectify that (fanfic wise). I only read 3 parts 
of it before losing interest. Her standard attack is a solar flare. I wonder if 
she can do a "supernova" as well. Wipe out everything within a 10km radius, 
along with herself of course....

Actually, we do have asteroid senshi (manga only).  I wouldn't want to try
writing stories about them, though.

I also did a fanfic with Sailor Earth (which nobody seems to read, grr).