Lobo, aka the Main Man, has been a DC staple since the early 90s. His first stories featured him as a villain, but his popularity exploded when he was reinvented as an antihero. Rather than being a generic villain, Lobo became a violent yet humorous character who served as a satire of the grim and gritty figures who populated the era. He had his own solo titles and appeared and starred in multiple other books, with his newfound fandom remaining strong throughout the decade. By 2000, DC produced another successful comedic property in the form of Peter David and Todd Nauck's Young Justice, and it only made sense for the Czarnian bounty hunter to cross paths with the young heroes.
Source:https://www.cbr.com/young-justice-lobo-clone-return/