Since I can't find the original thread, I decided to make another one.
Question: Could such a universe exist? Some who have posted a response on this subject before feel that it would "clutter the environment". I say thee "Nay!" If we can deal with a "cluttered" DCU (which is silly, since every character is going to be depicted in tandem with others), we can deal with an Earth that has a host of characters running around, if one is smart about it. You can either:
a) Use a "generations" model, in which a character actually ages, or,
b) Simply use less characters, by focusing more on the top tier characters.
Personally, a generations model could work. Character is introduced based on publishing date. Said character have their career, then he or she is "retired". But, if the character is still around, it has to make sense as to why this is possible. Ergo, unless the character is immortal, he or she is one and done.
So, in no particular, here we go:
* Superman is the most likely to still be active, due to his Kryptonian heritage. The question would be to either have his supporting cast split up, so that Lois Lane would be relevant in the Modern Age, or all of them come out when they were originally published.
* Captain America, thanks to the super-soldier serum, simply ages less. He'd be a hero to Guy Gardener, instead of "General Glory" (who does not exist, since he was intended to be a parody of Captain America). He would be the nucleus of the super-soldier program in all its totality, from physical enhancements that retard aging, to cybernetics, and so forth (I would play the "Superman Theory" from DOOMSDAY CLOCK into this). Basically, governments around the world would want to create "living weapons" as a precaution against both rival nations...and potential metahuman menaces.
* Metahumans would be broken down into two types: mutants (those who spontaneously become superhuman) and mutates (those who become superhuman via accidents). X-Men deal with the former, while Doom Patrol deal with a latter (Doom Patrol is more of a support group than a traditional hero team).
* The gods are real and living in this world, though under the veneer of mortality. Just to make things interesting, the Norse gods sided with the Axis Powers, while the Greek gods sided with Allied Powers. This brought Wonder Woman and Thor (red-haired version with beard) onto the battlefield as opponents. When the Axis lost, and by extension the Norse, the losing participants were forced to assume mortal guises while forgetting their true selves. Thus, "Thor" becomes a mortally-wounded Army medic named Don Blake, who would go on to be a medical doctor. However, Odin would set things into motion where his son would assume his true heritage, when Don comes across Thor's hammer, though he would not suspect that Thor's time as Don would create a new hero in Thor (i.e. the blond one).
* Wonder Woman begins her career back in WW1 (like in the movie), and inspires others to become heroes.
TBC.