Some of you seem to have missed one of Beppo's guidelines:
now these characters must had to been made by other publishers besides DC!
OOPS! Sorry about that -- I just got caught up with the flow of the "conversation" and forgot the original post.
OK, what about Warren Ellis' "Planetary" series from WildStorm?
1. In Issue #1, an alternate universe counterpart of the JLA (including an obvious parallel Superman) attacks Doc Brass and his group of heroes. All are slain except the maimed Brass.
2. In Issue #10, the Planetary Earth's equivalent of Superman, Green Lantern and Wonder Woman were all slain by the evil Four before they could begin their superhero careers. The alien baby was incinerated in his space capsule immediately after landing.
3. "Planetary/JLA: Terra Occulta" created a reverse world where the regular heroes (Elijah Snow, Jakita Wagner, The Drummer and Ambrose Chase) take the place of the villianous Four. They are opposed by Bruce Wayne, who invites Clark Kent and Diana Prince to join him. While this Clark clearly has superpowers, he doesn't wear a costume.