Scaramouche is a robot assassin hired by Aku to stop Samurai Jack. He is based on Sammy Davis Jr.
History
Scaramouche was sent by Aku to kill Samurai Jack. He saw Jack and was surprised to learn that Jack lost his sword. After a brief battle, he got decapitated with just his head remaining. He hopped all the way to Aku’s lair and told Aku the news. Upon seeing Jack by the destroyed time portal, Scaramouche was killed by Aku now that Aku knows that Jack had regained his sword.