One positive thing about secret identities is that it can explore the different facets of the character through one or both of the personas of the character. Classic example is Peter Parker, who is more willing to shoot his mouth off when he's Spidey. Since he can get away with dodging his opponent he can insult them or say what's on his mind, and if they don't know he's Peter then he doesn't face them retaliating on his Peter life.
Plus it's prime for the two person love triangle. You can't beat the main character's love interest being in love with their superhero identity, or being antagonistic to their superhero alter ego. Another fun trope is when they're needed as their hero identity, but one of the hostages or even the main hostage, like Bruce Wayne being the hostage for summoning Batman.
IMO, it's not merely a matter of supporting casts, but also a matter of the breadth of the world in which the characters inhabit. For example:
The poster child is The Fantastic Four, who largely lived in a celebrity bubble, with the exception of Alicia. They had other characters, like The Inhumans, or Wyatt Wingfoot, but these were almost always temporary additions.
Another example is Captain America. At various points in his run, most prominently during his Brooklyn Heights era, he had a rich supporting cast as part of his secret id. Whenever his secret's out, however, his cast tends to dwindle to The Avengers, SHIELD, and whoever SHIELD deigns let near him.
A problem that I have with this is that it "shrinks" the world in which the characters live. One has to wonder why they bother good-guying, when they're not part of any world beyond their Batcaves and Asgards. It's a personal preference, but I see merit in presenting characters that live in worlds bigger than just themselves. More to the point, casting every character as a supercelebrity takes away from the opportunities to portray the characters as human, with lives that including irritating neighbors, trying to be supportive of friends, and the ordinary pressures of life, with which most of us can identify.
Early in their run on The New Teen Titans, Wolfman and Perez balanced this pretty well with Cyborg, who had an outside life even tho a secret id was impossible for him. That's a particularly interesting contrast with Robin, who had a secret id, but no life outside of his work.
I don't think every character should have, or even needs, a secret id. As ed2962 said, it would make sense for Moon Knight, but not for Scarlet Witch. The secret id is also easier to swallow for characters that could reasonably evade surveillance, or majorly alter their appearance, such as The Atom, or (the real) Captain Marvel, than it would be for a character like Wonder Man.
Repeating my earlier post, I suspect that narcissism lies at the heart of the departure from the secret id. Too many of us seem to think that the world isn't any bigger than ourselves and the bubbles in which we choose to live. Only our own stories matter to us. It shouldn't surprise me so much that the way comic characters are portrayed reflect that.
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Bruce Wayne and Oliver Queen couldn't maintain a secret identity in the modern world. There are too many security cameras, cell phones, motion detectors, databases, drones to follow you around, satellite images, web sites where information gets shared, and so on. You'd have to have super-powers to do it.
Last edited by Trey Strain; 03-13-2018 at 05:38 PM.
Nobody can escape the surveillance state that we've accepted by default.
I address the problem here:
http://community.comicbookresources....78#post3523478
Last edited by Trey Strain; 03-14-2018 at 04:38 AM.