In his new film Kaabil, we hear Hrithik Roshan plays a blind man who impersonates various voices of the characters in the film. Says a source from the project, "Hrithik has to speak in the voices of various characters in the film including Ronit Roy and Sonu Sood. It's part of the script. He's now undergoing voice training for this purpose."
An actor speaking in the voices of other characters has never been done before. This would certainly be a new revolutionary move for an actor to assume multiple personalities.