Certain actors and movie stars may have gained immense success for a particular role or type of protagonist and chose to stick to it. While always playing the hero doesn’t mean always playing the same type of character, some actors rarely play the bad guy. Some of the greatest actors of all time never actually played villains, which proves that sticking to heroic roles is not necessarily a bad thing.

https://screenrant.com/movie-actors-always-hero-list/