I heard and read about her being a demon hunter.
What about this storyline:
For many years, Ashrah has been dealing with the unspeakable, the most vile creatures in many realms, even some that made it too earth realm. Nobody knows where or when she came from. The rise of the Dragon King has brought her here. She enters the tournement unknown to almost all who are fighting for their own purposes. She is not good, nor evil. She is a "hitman" of sorts. Makes profit for her slayings. She is also into the sporting challenge of a good fight. She has been hired by an "unknown" source to take out the Dragon King. The payoff will be large and the sport of taking down a huge target makes this all worth while for her. She cares nothing about the other fighters and if they get in her way, she will take them down to reach her final goal, the Dragon King.