Falis

Falis is one of the strongest and the most infamous bounty hunters in the world, even attributed with having slain a dragon. When operating near the border of Forland Kingdom, Princess Alita runs into her, and the two of them end up switching bodies by accident. Now stuck in Alita's body, she makes a deal with Alita to assume her identity and defend her kingdom. Falis' weapon of choice is the ancient katana Himetsuru (姫鶴, ひめつる, Himetsuru, lit. Crane Princess); she sometimes uses a dagger in conjunction with the sword. [Wikipedia]