Historical Examples. 1  He had discarded his first instinct, which was to hide in the intricate Tetrahyde cloaca. 2  A perforation leading into the cloaca at the hind end of this. 3  Agrippa, who cleaned out the cloaca, navigated its whole length in a boat.
Batman is the superhero protector of Gotham City, a man dressed like a bat who fights against evil and strikes terror into the hearts of criminals everywhere. In his secret identity he is Bruce Wayne, billionaire industrialist and notorious playboy.
Another example is Superman, who does not wear a mask when he is in costume, but wears eyeglasses and appears mild-mannered when he is Clark Kent, his secret identity. Types of characters that may have secret identities include heroes, superheroes, thieves, villains, supervillain, vigilantes, aliens, and  monsters .