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Exaggerated: Bob plays the character of Charlie, an ultimately good deity of niceness, but off stage, he's a cruel bully who mocks the other cast members, blackmails the directors, rapes the costumers, and sets fire to the theater after the show is over, just for giggles.
Downplayed: Bob plays Charlie, a flawed but good hero, but offstage, he's slightly rude to everybody.
Justified: Bob is a good actor, despite his lack of people skills.
Lampshaded: "It's a good thing for Bob we always turn off the cameras before he drops character!"
Deconstructed: Bob terrorizes the cast off stage, which makes it difficult for them to adore him in character as Charlie. They either can't play their parts properly or drop out of the production. The show ultimately fails.
Reconstructed: Bob is a nice guy playing a nice character, but finds himself being typecast in family friendly roles and isn't taken seriously by people. So he starts being a jerk to shake off his overly positive image.