The Jackal was a movie from 1997 that followed the villain (Bruce Willis) as much as the hero (Richard Gere).
While the movie had some flaws, especially Gere’s fake accent, I do really like that co...
Kind of related: in Sicario, the “main character” flips from the Emily blunt character to Del Toro’s character like halfway thru the film. Could say this was a flip from good to evil, albeit the lines are pretty blurred