Jimmy Olsen was a trailblazing news reporter who began his career as an apprentice and photographer. Both at the Daily Planet and Daily Star on parallel planets, the red-headed lads labeled "Mister Action" lived to that billing, and became best friends to the Supermen of their respective worlds.
However, there were other Jimmys who also had thriving careers as crusaders against crime. On Earth-Two in the 1940's, this boy was named Jimmy Martin who led his Minute-Men of America into various adventures alongside their hero, Hourman. Each was given versions of their idol's Miraclo pill, giving them momentary bursts of power. In one sense, this made them like the clones of Hourman's counterpart Multiplex. However, they also resembled another group of individuals on Earth-One.
On that world, several lads assembled to become the Jimmy Olsen Fan Club, and assisted him on various cases. Simultaneous to this, the evil Lex Luthor and the malevolent Cadums Project created clones of Olsen, although their life span was apparently short-lived. One such clone met Jimmy, himself a guard at Cadmus. While these clones and the Fans had no costumed careers like the original Jimmy, Olsen himself had several including that as Elastic-Lad. On Earth-Two, it was Jimmy Martin not Jimmy Olsen who had his own brief foray into superheroics as the Minute-Man!
And, in fact, even after having met a couple of his clones that were dopplegangers to Jimmy Martin, he met the counterpart of Jimmy's Minute-Man in the hooded menace known as Alter Ego. This being was a clone of Olsen made from cosmic energy mixed with an unhealthy portion of Jimmy's own ego, and as such had superhuman strength like Martin yet unlike that lad sought to humiliate his mentor Superman. Ego's career was even shorter than Minute-Man's, however.
And they were not alone in these tales, for Jimmy of Earth-One was allied with the Newsboy Legion of his world. Their parents, the original Newsboy Legion of Earth-Two never interacted with the other Olsen, although perhaps they were honorary members of the Minute-Men. Each team had Gabby, Big Words, Scrapper and Tommy (Tompkins, with the latter perhaps a cousin of Susie who was the niece of Earth-Two's Lois Lane, as well as being a cousin of Hourman's sidekick Thorndyke aka Second Sweep the Minute Man). The junior versions of the Legion were actually clones of their senior fathers, transplants from Earth-Two when they migrated to Earth-One alongside the original Jim Harper's Guardian alter ego. When Harper was himself slain later in life, the same Cadmus Project which cloned the boys also created a replica of Jim in the Golden Guardian. Another Legionnaire, Flipper Dipper, had a counterpart in a Minute-Man named Rodney who allied with Jimmy Martin.