Arrow's Main Villains Ranked From Worst To Best
3. Anti-Monitor
Why this character places where he does on the list is not due to his godlike powers, nor is it to do with the threat he posed to the entire multiverse. No, it's because he managed to do the one thing that countless others before him tried and failed to do: kill the Green Arrow.
Like his counterpart, the Monitor, the Anti-Monitor is a being of near-limitless potential. Hailing from the anti-matter universe, he is unknowingly awoken by Nash Wells, aka Pariah, and, after killing the Monitor, uses a Flash-powered anti-matter cannon to destroy the multiverse.
All hope is not gone, however, as a select few heroes, the Paragons, live on in an area beyond time and space, and it is there that they, along with Oliver's new Spectre persona, plan to reboot the multiverse. Succeed they do, but at a terrible cost. His energy completely spent, Oliver dies peacefully in the company of Barry Allen and Sara Lance.
As if that wasn't bad enough, the Anti-Monitor survives this encounter, and only on the newly formed Earth-Prime do our heroes finally best him, by way of a bomb that causes him to shrink for all eternity.