Every Villain The Arrowverse Has Teased But Not Used

10. Lobo

Everyone's favourite bounty hunter, Lobo's name literally translates to "he who thoroughly devours your entrails and enjoys it". If that does not clue you in how dangerous and offbeat this character is, then I do not know what will.

The eccentric alien was first alluded to in Supergirl's first season after the heroes mistook a Fort Rozz guard for a particular bounty hunter that they encountered prior to the events of the episode. Later in the third season while Kara is fighting an unidentified foe (later seen to be a Dominator) Alex wonders if the foe in question is a Czarnian.

Frequently portrayed as a Superman foe, Lobo has been a thorn in the Man of Steel's side. That said, he has also been an ally to the hero and also gone up against the likes of Etrigan the Demon, Wonder Woman and Green Lantern.

He possesses superhuman physical attributes on par with Superman, a healing factor, enhanced senses and intelligence. This, alongside his vast arsenal and devil-may-care attitude would make him a formidable foe in a future season of Superman & Lois, or even Legends of Tomorrow due to his irreverent sensibilities.