User blog comment:OneOfThoseCrazyGirls/5 Villains Who Must Appear in the Arrowverse/@comment-31614978-20180423191125

Unlike the others I don't see why Nekron wouldn't work. Arrowverse isn't afraid to change comic continuity to it fit its own stories (which is the way it should be) or just basic elements and build upon them with their own twist. All they really need is to introduce Nekron, the fact he's death related and can create zombies. He'd probably fit well in the Legends upcoming season's focus on creatures of myth and the like.

It's worth noting that the character Nekron was around just under 30 years before Blackest Night.