Tonya Harding – Margot Robbie
Although the transformations on this list are not all as dramatic as others, they are equally significant. While Margot Robbie appears to be herself in the black comedy I, Tonya, she also convincingly portrays disgraced figure skater Tonya Harding.
The Australian actress worked out for four months to get in shape for the role and as a result, became much more muscular than her usual appearance. At one point, she even injured herself from all the skating. In various scenes, you can see that Margot either wears very heavy makeup or none at all; she becomes Tonya on screen.