Remix with your character and I'll tell you whether they're accepted or not. NO Mary-Sues or godmodding. No Clan leaders unless I've given my permission. Don't put your cat in one Clan and give them abilities of another, unless it tells why in their backstory and I approve of it. Same goes for half-Clan cats. Loners and rogues may or may not be accepted. It really depends. If your cat is a loner, rogue, or half-Clan, the history is still optional, BUT I am less likely to accept if it is not filled out. For Clan cats I'd like a history but you don't absolutely have to fill it out. I hope I don't look like a control freak with all these rules, but they're there for a reason. Exceptions will be very few and very far bewteen.
Credit for the lineart goes to @Spawn_of_Ancalagon :{D