Wow, imagine wanting to turn hundreds of innocent children into eggplants because you used to get called one decades ago.
Unlike Eden Hawkins, this dude may have a good shot at counting. But there's only one way to know for sure.
What is the work?
"Super Chicken Nugget Boy vs. Dr. Ned-Grant and his Eggplant Army" is a childrens' novel by Josh Lewis and a sequel to "Super Chicken Nugget Boy vs. the Furious Fry." In it, the eponymous main antagonist raises an eggplant army to enact his revenge on Bert Lahr Elementary.
What makes him Pure Evil?
Dr. Ned-Grant intends to transform everyone at Bert Lahr Elementary into eggplants so he can use these unwilling thralls to conquer the entire world. These are all children and this sick mongrel wants to destroy their consciousness and free will so he can re-mobilize them as mindless drones to conquer everyone else. This is taken with the proper gravity, that when he turns a teacher named Mrs. Durbindin into an eggplant, she cannot move or speak at all until he activates the hive mind to briefly force her to hurt her own students, and Arnie Simpson the Salamander innocently takes a few bites out of her pulp, horrifying Fern who has to pull the animal away from her. Made worse is that her transformation happened right in front of all of her students, traumatizing them and making three of them cry. Following Mrs. Durbindin's tragedy, he goes on to lure dozens of students into the janitor closet connected to a tunnel leading down to his laboratory, absorbing their brain waves and transfiguring them into eggplants in what is known as the "egg-pedemic." He proceeds to do the same to Principal Hamstone. He also turns first-grade teacher Mrs. Sneap and detention monitor Mr. Pummel as well. This chaos goes on for several weeks straight, terrifying the children immensely. The reason he wants to do this so badly is because kids at school called him an eggplant when he was young, so he wants to take it out on their descendants who attend Bert Lahr, and calling that petty is an understatement.
When Fern and Lester visit him, he lies that he is not offended by what Fern was falsely accused of writing earlier and tells them to meet him in the supply closet, intending to transfigure them as soon as they arrive. He almost transfigures Lester before Super Chicken Nugget Boy intervenes. In response, he commandeers a legion of the smaller division (the ones who weren't originally people) to pummel him. They beat him brutally and incapacitate him, but he thankfully makes it out of there in time to intervene in what's coming down. Wanting to transform hundreds more students and force them into the larger division, he marshals the smaller division as an army and they march out through a manhole and into the playground, where they begin to terrorize the school and pummel children left and right so Dr. Ned-Grant can transfigure them when they're all out cold. He would have gotten away with this if Super Chicken Nugget Boy hadn't interfered and freed everyone from their eggplant shells, hence reviving everyone from their horrific predicament.
Realizing he is being defeated, he runs away with the still-transfigured Principal Hamstone. He shows no remorse for his monstrosity and untruthfully insists that The Eggplant forced him to mutilate the innocent against his wishes.
Mitigating factors?
My tush. Even though Dr. Ned-Grant is certifiably insane, he still retains moral agency and is fully aware of his actions and their impact on others. The fact that he is proud of being a madman and even once tells Lester his psychosis should be obvious to all the kids by now makes him even less sympathetic. He doesn't care about his only sentient ally, The Eggplant, since he scorned it for rightfully expressing its sense of self-preservation and would have gladly manipulated him into going on a suicide mission if The Eggplant hadn't outwitted him. Oh, and even though he got laughed at a lot as a kid, this doesn't make him a tragic antivilain in any way as he's just using being picked on in school to justify doing severe harm to the innocent.
Heinous standard?
The other villains Fern has to face are Dirk and Snort, and they tried to crush Bert Lahr with the Furious Fry, and it's not confirmed if anyone would even die from it, which makes for Fridge Horror. Dirk's attempted mundicide in Book 3 was against a Pluto-like planetoid far less populated than Earth, not to mention he and Snort participate in the efforts to stop Dr. Ned-Grant and become On & Off in the process, hence making him the most heinous character in the quadrilogy by far. Even if Pizza Planet was as nearly as populated as Earth, Dirk was merely trying to blow them up due to sincerely thinking they're evil while Dr. Ned-Grant is still trying to give billions and billions a fate worse than death out of nothing more than his own childish pettiness. So yeah, no issue here either.
Is he silly enough?
That's like asking if the sky is blue or not. Him trying to turn people into silent walking eggplants in and of itself is extremely silly. And when he is defeated, he says a talking eggplant made him try to give hundreds of children fates worse than death, and while this is obviously true, the cops don't believe him and he doesn't pick up on their sarcasm just before he's rightfully hauled into a cop car and is presumably now serving a life sentence in prison. Despite this, the kids are scared to death of him after he turned one of their teachers into an eggplant and aren't laughing when he sends his eggplants to turn all of them into such, so it's not an Eden Hawkins situation at all.
Verdict
A very easy yes, says I.