There's more to being an anime villain than just doing bad things. The most truly disturbing anime villains are the ones that just creep you out. These unsettling antagonists in anime can be freaky for myriad reasons. Sometimes, that creepy villain panache involves vomiting up snakes, which vomit up clones of yourself, which vomit up more snakes, which vomit up swords, like Orochimaru from Naruto.
Sometimes it involves becoming so obsessed with how another person smells, you kidnap him and try to eat his flesh in a gladiator arena, like Shuu Tsukiyama from Tokyo Ghoul. Sometimes, it just involves being a teenager who makes other teenager's bike racing experiences less fun. That might sound petty, but if you're a truly weird anime villain, like Akira Midousuji from Yowamushi Pedal, you can be every bit as unsettling as any fictive mass murderer. Check out these chilling villains in anime, and try not to shudder too hard.
If you've heard of Fullmetal Alchemist: Brotherhood, you probably know what's coming (certainly, there has been no shortage of memes on the topic). Shou Tucker is a state alchemist, who won his position by creating chimeras that can talk. Or, pretending to, anyway. Actually, he created them using alchemy to fuse his wife and his daughter with dogs, permanently destroying every being involved.
So, why is he more unsettling than, say Solf J Kimblee, who dresses like a slave owner? Because Solf J Kimblee knows he's evil — he just doesn't care. Meanwhile, Shou Tucker actually thinks what he did to his wife, his dog, and his daughter, was morally justified. Few things are more frightening than evil that doesn't recognize itself.
Caster is the servant of a serial killer named Ryuunosuke Uryuu in Fate/Zero. Not only is he absolutely inclined to do his master's horrifying bidding, he also has truly unsettling motives of his own. In his previous life, he was devoted to Joan of Arc, a character based on the actual historical figure. When she was executed as a heretic, Caster gave up on trying to be a decent person.
He quickly went from small sins like squandering his money, to catastrophic sins like raping and murdering hundreds of little boys. As the servant of a serial killer, Caster delights in giving his victims glimpses of hope they might be saved, before murdering them in the most brutal ways imaginable. With such a harrowing resume, you'd think the dude would be more intimidating than creepy, but his character design, particularly his enormous, rolling eyes, put him over the edge and make your skin crawl.
Subaru Natsuki is a normal boy who has been transported to the magical world of Re:Zero. He discovers that death results in a reset, unless he finds a way to keep a certain girl alive. It is very clear that Subaru does not want to experience dying any more than he has to, as it is painful and terrifying for him.
The main antagonist of Season 1 is Betelgeuse, a cult leader with a jarringly flexible body. He has a very disturbing flair for the dramatic, and mercilessly spills blood without warning. Betelgeuse will send chills down your spine because he genuinely seems insane. He shows no remorse as he tortures a poor girl named Rem, constantly staring and smiling in his creepy way.
Satoru Fujinuma is 28 when he suddenly finds himself in his 10-year-old body, transported 18 years into the past in Erased. He realizes that he has the opportunity to stop the murder of his classmate, Kayo Hinazuki, and uncover the identity of the serial killer who tormented his hometown.
Gaku Yashiro is Satoru's teacher, and seems to be a father-like figure in his life. However, it is later revealed that Yashiro is actually the person behind the kidnappings and murders of thirty cases. Yashiro confesses that his brother forced him to rape young girls, until they accidentally killed one. Since then, he had an insatiable desire to explore death and proceeded to experiment on killing little girls to understand his obsession.