One of those was Atlas, done so for the First Issue Special #1 (April, 1975)...
...but, likely even the "King" wouldn't have been able to predict the strange turns his life took over the years!
First Issue Special
First, readers see Atlas fell Kargin, the champion of Hyssa the lizard king in a land out of time, then a flashback to Atlas as a boy, as his father was killed by the forces of King Hyssa, and only due to his unnatural strength and ability did Atlas escape. Being found by Chagra the seeker, who learned the lad got his powers from a shard of the Crystal Mountain (a land Atlas was from). The two traveled together, as the boy grew into a man, and with his great strength, Atlas also had great heart, saving many villages from various evils, with Chagra there encouraging him on, so Atlas could have a final confrontation with the lizard king, and then take Chagra to the Crystal Mountain.
That's where the only 20th Century produced comic of Atlas ended....
....that of modern day Metropolis.
Guardian (as well as fellow First Issue Special headliner, Codename: Assassin), even meeting Batman in an issue of Justice League of America (#42), as well as dealing with the temporary new protector of Metropolis, Mon-El.
Forager (a Kirby creation that met an untimely end in Cosmic Odyssey). This six issue mini-series follows his adventures through time, meeting many of Jack Kirby's characters, including two different Sandman, one Manhunter, OMAC, the New Gods including Mr. Miracle, even the Deadman robot Kirby used in the Forever People....and Atlas and his helper, Chagra (Chagra was even more important to the book than Atlas).