I am here to advocate the following villans as Pure Evil, whether TV Tropes thinks so or not:
Frank Skimmerhorn: Genocidal towards Native Americans, willing to hurt Caucasians using his men disgused as Native Americans just to perpetuate continued conflict with Native Americans, shoots a man in the back who had come in surrender, and tries to punish one of his men for refusing to along with his genocidal actions and refusing to follow his orders.
Grodd (Injustice 2): He tries to help Brainiac destroy Earth but then ALSO plans to betray Brainiac later down the line, because as he explains to Black Adam and Aquaman: his true loyalty is to himself, not Gorilla City, Brainic, or Earth. He also plans to forcefully extract the scarab from the teenage Jaime Reyes without regard for the cost.
DCEU Luthor: Tries to frame Superman by murdering large numbers of innocents (including his own assistant Mercy) and making it seem like Superman is the perpetrator. He also kidnaps Martha Kent to blackmail Superman into fighting Batman to the death, and then creates Doomsday and unleashes him on the Earth just to be spiteful. All because he's a sadistic little twerp who enjoys bringing the powerful to their knees.
Mutant Leader: A psychopath who seems to just be into destruction and violence for destruction and violence's sake. Under his leadership the Mutant gang has indulged in everything from murdering nuns and children to rape and mutilation to just general chaos and anarchy.
Ocean Master (Justice League: Throne of Atlantis): He tries to start a war between Atlantis and the surface world due to his hatred of the latter, and when his mother gets in the way, he kills her. Hardly remorseful over murdering the woman who gave birth to him, he instead mocks Aquaman (who he dismisses as a bastard child) about it. As to his wanting to avenge his father, Zander Rice's father was killed by Wolverine, and yet he is still regarded as a Complete Monster (even when he continually told X-23: "This is for my father")
Dottie Underwood: The sadistic and bloodthirsty Red Room Assassin and Peggy Carter's arch-enemy. Lacking any sympathetic reason for becoming a Red Room operative (and nothing to indicate she was even necessarily forced into it), Dottie took to her training with a fanatical zeal even as a child, snapping the neck of one her sparring partners even after said sparring partner had earlier showed her kindness. And Dottie snapped her neck anyway without any remorse. As an adult, she still enjoys killing, murdering several people over the course of Agent Carter's first season, including hitting a movie theater full of innocent people with a gas that makes said people violent and drives them to brutally kill each-other with their bare hands. As if that wasn't enough, she also actively helps Dr. Johann Fennhoff in his plan to inflict the same terrible weapon on ALL OF NEW YORK CITY. And unlike him, she has no sympathetic backstory, no dead brother to grieve, no nothing. Just a sadistic, faux affably evil sociopath who enjoys the violence. Even her obsession with Peggy Carter is more just a sadistic interest rather than genuine respect or concern for her, no different than Joker's obsession with Batman. Similarly, her helping Peggy Carter in Season 2 was motivated purely by self-interest. Peggy herself outright acknowledges that Dottie is "despicable".
The Ogre (Gotham): A serial killer of women that he seduces, snatches away, and turns into his household servants before inevitably killing them after he either gets bored or they do or say something that annoys him. He also galvanizes Barbara Keane into embracing her dark side and murdering her own parents. Oh, and he also keeps police from trying to catch him by threatening their families and loved ones if they don't desist.
Prometheus (Arrow): Murders scores of policemen and innocent civilians (including a single mother begging for her life), tortures Oliver Queen over several days into admitting that he enjoys killing people (as well as making him think he killed Evelyn Sharp), murders his own wife when she becomes too much of an inconvenience to let live, and finally kidnaps Oliver's son and tries to make him choose between saving his son, and saving all of his other friends and family that are still on a now rigged to blow Lian Yu. When Oliver manages to save William without killing Prometheus, Prometheus decides to kill himself to kickstart the self-destruct, even though all of his so-called allies are still on the island. Yes, yes, Oliver murdered his father, but 1) Zander Rice lost his father to Wolverine and is still considered a CM, and 2) Prometheus' anger and moral posturing on Arrow is utter hypocrisy in view of everything described above. Oliver even outright calls him a hypocrite. So he is not exempt.
Andrew Diggle (Arrow): Chose to join Damien Dahrk (as all the Ghosts did), abandoned his own family, and actively helps Dahrk in his plan to kill off most of the world's population. And unlike Dahrk himself, Andrew Diggle loves no one, since he (again), abandoned his own family, got Laurel Lance killed and mocks his brother over it, tortures his own brother with sadistic relish, and threatens to murder his own sister-in-law and niece. He nas no redeeming qualities at all, and yes, he took the yellow pill that made him obedient but...that was his choice.
Riddler (Telltale): In just one episode manages to cement his status as the most evil and twisted villain in that Batman universe to date via putting people in sadistic "murder boxes" that alternate between decapitating people, slicing off their fingers, and superheating beneath their feet. He tortures Rumi Mori by slicing off some of his fingers before trying to decapitate him (after earlier threatening his family to get him to sell missiles to him in the first place), murders Lucius Fox by blowing him up with a missile and then sadistically rubs it in Batman's face twice, tortures and murders a member of the Agency, and tries to murder every Agency member in Gotham City via the missiles he got from Mori while also forcing a trapped Batman to choose between letting Agency Agent Avesta be tortured to death by multiple ultrasonics blasts or letting her teammates be decapitated one by one. Depending on how Batman chooses, she'll either go deaf or at least one of her teammates will be killed. And again, all of this is just in ONE episode. Not to mention he's currently worse than even that game's takes on Joker and Zsasz!
Simon Stagg (Arkhamverse): While Simon Stagg is always a bad guy, he also usually has the one positive trait of caring about his daughter (in a twisted sort of way). The Arkham version on the other hand, despite outwardly appearing a nice guy, is in fact in cahoots with Scarecrow and alongside him performed unethical experiments on innocent people that drove them to madness and death, with Simon also sadistically taunting at least one of these people prior to their death. He dislikes Scarecrow, but because he views him as impractical rather than because he has moral standards. He also helps Batman stop Scarecrow's plot...but only because Batman scares him into doing so, not because he actually cares about anyone but himself. And, unlike his mainstream version, he doesn't even have a daughter to love or care about.
Hitler (Marvel): 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). The argument of "offscreen villainy" is nonsense, because multiple flashbacks to the WWII era of Marvel gives plenty of proof of the Holocaust happening, and the horrors of World War II. Of all the many versions of Hitler in fiction, the Marvel version is one of the few that actually shows, explicitly, the evil of the man, plus giving him extra evil AND him being a Card Carrying Villain.
Ultimate Black Widow: Murders Hawkeye's family, frames Captain America for it, helps an army of supervillains invade America, and murders Jarvis and mocks Tony's loss. She has no remorse for anything she does, and is just a sadistic, America-hating terrorist who's misguided attempt of revenge against the USA is no more sympathetic than MCU Ronan's campaign of "vengeance" against Xandar.
Brian Banner: The Hulk's abusive father who violently murdered his mother and then bullied him into not exposing his crime. While far from the only abusive father in Marvel, he took it farther than most by murdering Bruce's mother brutally (and in front of him). And while even this may not seem any worse than how, say, Norman Osborn has treated people over the years, it must be remembered that Brian never had Norman's superpowers or resources, nor for that matter has he appeared with anywhere near the same frequency, and so has had less opportunities to do evil.
Cassandra Nova: Committed mutant genocide when she destroyed Genosha and in the process got a bodycount numbering in the millions.
Yeah...you're gonna have to do a lot better than that as far as persuading me goes. I think they all fit, and until you present a remotely tangible argument as to why they don't, I'm gonna go and assume that they do.
Also, for the record, I do NOT consider they're not fitting it on TV Tropes to be a valid argument, as those people are not infallible by any stretch (as someone who used to edit there, I know that fact intimately). Every last one of those villains fits for the reasons given, unless you can present some solid arguments to the contrary.
while the Invasion Force are Pure Evil as a concept (being parallels to the Nazi Party and all) I thought it was impossible for two Pure Evil *individuals* to exist in the same work while one PE still exists / is active..
Noah is very much active and much more of a threat than Stalker.. Stalker is a disgusting raping piece of crap, sure, but Noah is literally "Space Hitler" (sorry for the stereotypical names but that's the best way to describe a character as genocidal as Noah).
so while Stalker and Lynx are monstrously cruel and degenerate their combined crimes would still be very tiny compared to a galactic dictator.. Noah may not personally rape, torture or kill but he has pretty much allowed his Invasion Force to do so multiple times over countless worlds and thus he's guilty of so many war-crimes it's unimaginable (even by supervillain standards).
I'm not arguing Stalker is a nice guy AT ALL.. just that he is much more limited in what he can do.