Part II of my Complete Monster lists, this time for Marvel ones.
As the name implies, a Complete Monster is a villain who is pure, irredeemably evil, sufficiently heinous in relation to their peers, and bereft of many moments of genuine kindness, compassion, or remorse. There is ultimately nothing sympathetic about these characters, though there is a bit of a divide between the ones who can at least be called "cool", and the ones who just aren't. Either way, they're still pure evil.
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Besides doing/attempting all of the atrocities his real life counterpart did/attempted, there's also his being even more into the occult and also knowing full well that he's evil and not caring. In fact, he acknowledged that his evil was unmatched and deliberately took in a young Johann Schmidt because he saw in him someone who he could mold into a monster like him (never mind that Schmidt was already one). He's so evil, that the bullets in his gun have enough concentrated evil in them to pierce Doctor Strange's magical barriers!
The MCU version, who creates AIM, tests the Extremesis virus on people despite the harmful (and fatal) side-effects, and goes to EXTREME lengths to spite Tony Stark JUST because the guy pulled a mean joke on him once (which does not count as a sympathetic backstory).
He tries to kill all life in the universe and actually does manage to destroy quite a few planets.
A genocidal despot who wants to wipe out and/or enslave humanity simply because he views them as inferior.
Despite being one of Marvel's answers to the Joker, despite killing for sheer enjoyment via putting people in elaborate death traps, despite having no sympathetic backstory...616 Arcade ISN'T this. Reason being that, twisted as he is, he does have a sense of fair play. The Age of X version on the other hand, IS a Complete Monster. Lacking the 616 version's sense of fair play, he kills Mutant prisoners in large numbers at the government's behest and even using another Mutant (Scott Summers) to do it. Yep. So sadistic that he has one Mutant kill others with his own powers against his will.
Revealed himself to be this during Rick Remender's Captain America run. Basically, once he was in a position of absolute authority over others, he went absolutely off the rails and basically behaved like a true Nazi.
Committed his share of war crimes in World War II, including strangling Polish freedom fighter Citizen V to death, flaying the Human Torch, torturing Captain America and Bucky Barnes with sadistic pleasure, getting an entire German town destroyed, and engineering WMDs for the Nazis. He also became so hellbent on killing Captain America for his disfigurement that he even became willing to sacrifice his own wife and son to achieve the end, not to mention that his treatment of his son caused him to become a supervillain too. And we haven't even gotten to the crimes he committed AFTER World War II...
Including in "Avengers Earth's Mightiest Heroes". This is a dude who was overjoyed by his own son's death and once blew up a base that had thousands of his own men it. And of course he's a Nazi.
Even with a Freudian Excuse, the MAX version is still sufficiently deplorable that he nevertheless fits this.
A sadistic being who has relished manipulating and destroying mutants and seeks to wipe them all out. And unlike other Sentinels, who are only following their programming, Bastion has human-level sentience and emotions and therefore knows full well that what he's doing is evil. And he doesn't care.