Highlights include: "The genre with which secret identities are most associated is the American comic book. Superman is generally considered to be the first modern day superhero (while not quite the first costumed crime fighter) and his alter-ego, mild mannered reporter Clark Kent, helped popularize the secret identity throughout the medium, while sparking several trademark superhero clichés. These included the adoption of a timid persona for an everyday identity, wearing of the heroic costume beneath the character's everyday clothes, and the phrase "this looks like a job for..." when switching between identities."
Also: "The secret identities can be multi-layered; for example, Superman, The Shadow and Moon Knight all have real names, adopted identities and crime fighting codenames. Sometimes the distinction as to which identity is the "real" one is blurred; it has been said that Clark Kent pretends to be Superman, while Batman pretends to be Bruce Wayne rather than vice versa."
And finally: "Famous fictional characters with secret identities include:
* Kimberly, Trini, Jason, Zack, Billy, and Tommy - Secret identities of the original Power Rangers
* Clark Kent - Secret identity of Superman
* John Reid - Secret identity of The Lone Ranger
* Steve Rogers, John Walker - Secret identities of Captain America
* Tony Stark, James Rhodes - Secret identities of Iron Man
* Bruce Wayne - Secret identity of Batman
* David Webb - Secret identity of Jason Bourne
* Peter Parker - Secret identity of Spider-Man
* Diana Prince - Secret identity of Wonder Woman"