Previously we considered two nuclear powered heroes and their flame-haired girlfriends. Our next two candidates for consideration are a duo of caped crusaders who, thanks to the miracle of science, gained similar powers and were tangentially connected to those fire powered pairs of guys and gals. And yet, each scientist turned superhuman used their powers in drastically different ways, leading one to become famous and the other infamous, one successful and the other flustered, and both dependent on outside factors to retain their powerful edge.
Danton Black was Professor Martin Stein's assistant at the Hudson Nuclear Facility, and when Black's jealous meddling initiated a set of circumstances ultimately leading to a nuclear meltdown, not only did Stein and young Ronnie Raymond become Firestorm... Black become something more as well. As opposed to Stein and Raymond's fusion into a combined being, Black's power was fission leading to the creation of similar smaller duplicate. Each possessed super-strength and tough exteriors, along with a mental connection with Black himself. Donning the costume of Multiplex, Black repeatedly attempted to extract revenge on his former colleague and current foe(s).
While it was Multiplex's machinations that caused Lorraine Reilly to be kidnapped and experimented on, leading to her becoming Firebrand, Hourman's relationship with Lorraine's counterpart Danielle was romantic albeit brief. Yet both involved the gals' father, Lorraine's U.S. Senator father and Danielle's steel magnate, in failed attempts by criminals to broker deals with their sires it led to the wrath of their daughters. This was the end of both relationships.
Multiplex periodically needed transfusions of energy to fuel his dividing ability, Hourman's own addiction to Miraclo caused him to become increasingly dependent on it. Eventually, like Black, Tyler devised an energy-related means of activating his own inner power, in the form of black light and specially the ultra-violet portion. In addition, Hourman became a founding member of the Justice Society, while Multiplex's only allegiance was to the criminal 2000 Committee, although his arch-enemy Firestorm was a member of the Justice League at that same time.