Descartes

Descartes is a large bandit who was after Vash the Stampede. He had a giant cybernetic arm, a green mohawk, and he wielded a giant boomerang. Apparently he was a horrible womanizer. Initially, Meryl, Milly and Ruth Loose thought he was Vash. He however thought Ruth was Vash, so they attacked each other. They soon realized they were wrong, and that Vash had escaped, upon doing so, they team up. They soon kidnap Meryl and Milly, but they are rescued by Vash. Vash promptly defeats Descartes and Ruth, making his getaway.

Trivia

 * In the dub, his name was not mentioned, and was only featured in the credits.