OC's can not be related to anyone in the Naruto series.
As a rule of thumb, if your character is stronger or as strong as pain, they are probably too strong and wont be accepted.
If you are going to be a canon character, you must be in character. This means that you can not have Sasuke wake up one morning and head back to the leaf village, or have Sakura suddenly go evil.
You can not modify your bio unless you have permission from a staff member.
In the Naruto world, everyone has one element that they are strongest in. That means that you can not have a justsu controlling rock and others with lightning and fire. Choose one theme and stick with it.
BIO's MUST be accepted before you can RP
You can not be more than one major canon character, otherwise it would mess up the plot...such as Naruto and Sasuke being roleplayed by the same person. It would not work unless the person roleplayed with themselves...which is silly.
No Mangekyo sharingan on non cannon chars. This is something that is supposed to be unique, and without this rule too many people would have it.
If you are unsure if something is right about your BIO or not, you can ask a staff member.