The Chameleon is a Sim in The Sims 3: Ambitions. He's a dangerous criminal with extreme skills for disguising.
Not much is known about the Chameleon's past as he changes his face as often as his name. On one day, he poses as a talented cook in a restaurant before plundering the cash desk, the next day you see him disguised as an electrician "fixing" the security systems one day before a bank robbery. It's impossible to say where this thief will show up next and what he will look like. His house contains a giant dressing room for taking thousands of different disguises. He walks the streets everyday with a new face. His skills in disguising made him a perfect agent for the criminal organization Crime Lords Inc. for which he interacts with various people to blackmail, or, as the syndicate calls it, to convince people to pay the "insurance". During his long time in the organization, he became friends with the criminal hacker Mast3rm1nd.