Here's an interesting nugget from the Fencon
I think we all remember the huge "Death of Superman" sequence a decade or so back, and how, just when it looked like yes, they were going to close the doors on an iconic character forever, they brought him back. For some of us, it felt like a cheat, with the original "death" being pretty much a publicity stunt that they never really intended to follow through on.
OTOH, there have been a number of costumed super-heroes who've been able to have multiple incarnations without it feeling like a cheat. Batman has been rebooted several times for successive generations, and for a time the DC multiverse was arranged such that each of them occupied his own universe. The original Golden Age Batman, who fought in World War II and subsequently retired to marry a reformed Serena Kyle, lived on Earth 2, while the Silver Age Batman lived in Earth 1, which was supposed to be contemporary for the readers of the 1970's. Presumably the Bruce Wayne of Earth 2 eventually grew elderly and passed on when his time came, but it wasn't really dwelt on. By the late 1980's and early 1990's, the second incarnation of Batman was getting a little dated, so DC ran Batman: Year One
, an edgy new retelling of how Bruce Wayne first assumed the cowled cape of the Dark Knight, set in a world just entering the Information Age.
And there were the several different versions of the Flash. Each of them had a distinct character with a different backstory under the costume, so the (presumed) death of the earlier version of the Flash and the appearance of a new one had more the feeling of the passing of a torch.
If we move beyond the costumed superhero genre of comics, we find many sf comics in ultratech and cyberpunk settings in which technology has made death negotiable instead of final. For instance, Schlock Mercenary
has characters who regularly get "killed" only to be brought back by technology indistinguishable from magic to our 21st-century perspective.
However, this raises the problem of how to have adequate stakes for your characters when "life and death" is no longer an absolute. Most writers of ultratech settings have done something similar to the Eclipse Phase game and included some form of "restore failure" risk to maintain the possibility of permanent death. Alternatively, some forms of technological resurrection may have a social stigma attached to them, and characters who have had to undergo it may find themselves unwelcome on certain worlds -- which could create some very interesting plotlines if they have
to go there for some kind of business and must conceal their status.