IMO I’d probably have to go with Jimmy from Mouthwashing. I think that he’s a very good representation of a very real kind of person. A person who is narcissistic, who is unable to take accountability for his actions, and who refuses to see himself as a monster, even as he continuously does monstrous things. He’s basically like a co-worker from hell, which is part of why he’s so horrifying.
It’s hard to pick just one but I’ll go with one who doesn’t get the respect he deserves as a character: Anton Castillo from Far Cry 6.
Say what you will about the game but I was genuinely surprised that the villain was dismissed by so many. Aside from being played by a brilliant actor who delivered a fantastic performance his character is quite honestly one of the best depictions of a fascist dictator I’ve ever seen in fiction - and especially video games. Whatever other problems the game may have Ubisoft at least got its depiction of fascism very accurate.
Too many attempts at creating fascist-coded villains end up making them too intelligent or too crazy and they become unbelievable archetypes as a consequence. FC6 did not do this with Castillo; he is the perfect example of the kind of populist pseudo-intellectualism the far right loves littered with all the same hypocrisy and ruthlessness that actual fascist leaders have historically had - as well as an appropriate, believable level of cowardice and incompetence while still maintaining the illusion of a charismatic strongman.
I don’t know if he’s the ‘best’ Far Cry villain overall but he’s definitely the most realistic.