NO HENTAI/PORN!!!Anything else is acceptable. Strong violence/gore is not an issue if you have read the stories/manga

It is acceptable to have almost anything hapen with the characters... For example you could have a fan fic where Junsei kills Sakura and everyone else tries to kill Junsei... or All the characters could be allied and fighting your own made up characters... or soemthing. That way i don't have to worry about you posting Fan Fic's with spoilers in, because even if there was a fan fic based after all the twists and revealed who was on who's side at the end of the stories (etc) because people who haven't read that far can't know if it is true or an alternate reality chapter.

HOWEVER, if you add your own characters, make them as powerful as Akane or Sakura at the very most... (The story characters should be kept around about the same strength as they are) That way Junsei and Senhin are still as kick ass as they should be
Cat, 'The Return of the Nusumi' may not be suitable, but does that really matter? They can think up graphic violence on their own; I did...