These are Inconsistently Admirable heroes who darken the mood of the story, otherwise known as Knight of Cerebus.

For a hero to count, they must have some villainous or morally ambiguous traits and/or committed serious crimes that make the story mood heavy, serious, dark and stern to contrast with most lighthearted characters.

Note: This category differs from Seriously Good because those heroes, while they may be serious but don't necessary darken the mood of the story.

Game Changers can't be Love Exalted due to being taken way too seriously and darkening the mood unlike characters who may be serious but still taken lightly.

Their complete opposites are the Comic Reliefs Inconsistently Heinous.