Loose Ruth

Loose Ruth (or Constance Rifle) was a bounty Hunter who is after Vash the Stampede to claim his bounty. He initially believed Descartes to be Vash, and attacked him. He, after soon finding out Vash's identity, teamed up with Descartes and his crew. They kidnap Meryl and Milly, in an attempt to draw in Vash. He soon finds them, and fights with Descartes and Ruth. After Vash defeats Descartes (with his own weapon) Ruth detonates a powerful explosive, and is soon hit by Descartes' boomerang. It is implied by Meryl he was taken into custody after his defeat.