2) Booster Gold
Possibly more than any other hero on this list, Booster Gold is defined by the fact that he’s from the future. A living embodiment of the theory that advanced science is indistinguishable from magic (or, in this case, superpowers), Booster’s uses his future technology to masquerade as a superhero in the present.
Originally from 25th century Gotham City, Booster Gold AKA Michael Jon Carter is initially a gloryhound from the future who steals a load of tech – with his robot sidekick Skeets – and travels back to the past to achieve fame and fortune by becoming a vigilante. Over time, however, his greediness abates and he discovers the true hero underneath.
Booster Gold, along with his frequent partner in crime-fighting Blue Beetle, is a true fan favourite. The wider world might get to know him soon enough, too, if the purported movie from Arrowverse EP Greg Berlanti ever gets off the ground.