There is no debate who the top two DC super-villains are.
Lex Luthor and the Joker continue to occupy the top two slots as the World's Vilest, as they have done for the last 75+ years continuously. Luthor used to be #1, now Joker is #1, but neither of them have ever dropped below #2 at DC.
No, this thread is all about who you think is "Numero Tres" in DC's Hierarchy of Villainy after LL and Mr.J (or Mr.J and LL).
This is NOT about which villain is your personal favorite, but rather which villain's resume do you feel is stacked enough, both in-universe and IRL publishing, to go alongside the World's Vilest duo.
No antiheroes nor bad girls gone good. Will Allow for characters who may have had a "good" stint, but over 90% of the time, they must be evil.
I don't know for sure myself, but here are my own top candidates:
1. Cheetah - this is who it should be (to mirror the heroic trinity) ... Except she's been 3 or 4 different identities and lacks truly memorable feats across the board. And she is usually much less of a threat than other Wonderverse rogues like Ares or Circe.
Your choice(s) for #3 overall baddie in the DCU?