Kasumi

Kasumi, also known as "the Kunoichi of Destiny", is a female ninja skilled in the Mugen Tenshin Style of Ninjutsu. She was to become the 18th Master of the Mugen Tenshin Ninja Clan, but ran away in order to enter the Dead or Alive tournament. There, she hoped to defeat the one responsible for crippling her brother Hayate. By leaving the secretive ninja clan, she became a nukenin (runaway shinobi). This means that she must live on the run from her former comrades every day as they seek to silence the "traitorous" Kasumi.

After having won the first Dead or Alive Tournament (and killing Raidou), she was captured by DOATEC and a clone of her was created. However, she managed to escape (defeating her clone in the process) and made an attempt to return to her village, but she wasn't allowed to, due to the fact that dishonoured ninja can never rejoin their respective clan.

Credits:
Papacha, and Megaman_Zero from Wikipedia.