The undercover identity of Toph Bei-Fong from the TV show "Avatar: The Last Airbender." At a very young age, she signed up for a fighting tournament under this name to escape her parents' detection, and proceeded to kick the asses of all people (mostly grown men) who dare to stand before her.
And now, I give you your champion... The Blind Bandit!
I will offer up this sack of gold to anyone who can defeat the Blind Bandit! ...What? No one dares challenge her?