Just as the title suggests. Probably going back from the 2000s or so, because there really hasn’t been many. There’s been a lot of modernisation of old villains (Annihilus, The Skrulls etc) but very rarely new ones. Are they any you think of with the kind of staying power that says they’ll be here for years to come?
Here’s a few I can think of:
The Black Order (probably THE biggest new additions)
The Hood
The Gorgon
Morlun
Knull (only just arrived but I feel like he will have staying power)