User blog comment:ZSomji16/The Flash (Season 4), Arrow (Season 6), Legends (Season 3), and Supergirl (Season 3) Villains and Big bads/@comment-27673963-20170327091120

Arrow: Richard Dragon or Malcolm Merlyn

Flash: Dunno but not a speedster

LOT: Someone like Anti-Monitor or any other alien who is a big threat but not as tough as characters like Darkseid

Supergirl: No Idea, someone actually tough though