Ryan George, an actor famous for playing multiple characters on YouTube, typically being the only actor in said YouTube videos, is perfect for the role of multiple man.

Who is multiple man? Multiple man is a mutant whose powers are duplicating himself, allowing him to do multiple things at once. In the movie x-men: the last stand (which is the only time this character has been used in a movie) he is said to have robbed 27 banks at once.