Alright, here are the guidlines:
You can use a character from any published book. However, if it is not a well known book/character, you may want to write a short introduction.
You can use a character from any work you yourself have posted on Kaw.
You can use a character from any work another author has posted on KaW, so long as you have that author's permission.
No excessive cursing, no bypassing, no over-powered characters, posts must have some good solid information/interaction with others, try and include everyone, the roleplay doesn't always have to be about you, don't get blood on my floors, ect.
If you get any blood anywhere in my cafe you have to pay for the damages. (This is a long-running joke between me and the regulars)
Use decent grammar, punctuation, all that jazz. Also, use Ooc (out of character) but Bic (Back in character) is optional.
Anything else, feel free to ask.