no god-modding.
(that means no saying "throws u into the air and stabs you killing you).
no shitty naruto s**t E.G (runs up a wall and burst some shitty sounding chakra flame at you)

that's pretty much it..

oh also, every person is limited to 5 men in battle, but them men can be godmod killed by the other person. it just sounds cool to have 5 men with you, that's a 12 man fight then. and you can control them.
oh yeah and that brings me to my final rule.
you can't kill every single one of the 5 men in one turn, one per turn.

don't just leave a roleplay half way through, if you leave just say "i quit this battle" and count it as a loss.