I actually didn't had a bio till I was 3 elements B-ranks user XD (but new bio rules weren't applied yet)so u cant start battling in the battle arena, u cant participate in the fights or get a sensei if u dont have an approved biography of your rp character.
Here you gocan some1 give me a biography example ?
thxHere you goYou must be registered for see links
The rules and the template are pinned and u can also take a look at some biographies to give you an idea^^