Are you tired of watching anime where characters make rational choices based on healthy mental functioning? If so, you might want to check out some shows that feature mentally unstable anime characters.
What makes insane anime characters so great is that they throw predictability right out the window. Characters with antisocial personality disorders, a condition that pops up frequently amongst anime villains, don't respond to situations the way you expect them to – building suspense and keeping you guessing about what's going to happen next and what's motivating them. Other characters with more common psychological symptoms like anxiety can be intensely relatable.
Note: "Crazy" anime characters aren't always portrayed in the most sensitive or realistic of ways. While these characters are engaging, they're often based on harmful stereotypes. In real life, people with mental illnesses are actually way more likely to be victims of violence than to act violently themselves. That's not the case in anime.
Future Diary's Yuno Gasai is one of the most notorious crazy yandere in all of anime. On the outside, she seems sweet, albeit a little clingy. The protagonist Yukiteru quickly realizes that her clinging is actually closer stalking and that her love looks more like violence.
Why is Yuno like this? Most people think it's due to her childhood, which involved being severely abused by her parents.
Himiko Toga only appears briefly in the My Hero Academia anime, but it doesn't take long for viewers to deduce that she's super unbalanced. When first introduced to the League of Villains as a potential new recruit, Himiko claims that she wants to kill Stain, that she wants to become Stain, and that she loves Stain.
Why? Because according to Himiko, life is "hard to live" and she wants to make it "easier to be alive." These are not the words of a mentally stable person.
Midari Ikishima is a third-year student at Hyakkaou Private Academy, Kakegurui's gambling school. There, her mental issues are on full display. She's a compulsive gambler who doesn't keep track of her earnings.
Plunging herself into financial ruin would be bad enough, but Midari isn't satisfied with that. No, she needs her own life to be in peril, even if she gets nothing out of it. For example, her masochistic desire to "feel alive" leads to masturbating while holding a gun to her own head.
Death Note has a lot of characters that could be interpreted as mentally ill, but Teru Mikami is perhaps the clearest example. Mikami lives a life of obsessive rigidity and isolation. While this serves him well in his career as a defense lawyer, it leaves him exquisitely vulnerable to being as Light Yagami's right hand.
When Mikami gets his hands on the killer notebook, he goes full tilt crazy and starts not only killing criminals but literally orgasming during the process. When he realizes that Light isn't God and is, in fact, a deeply flawed human, he responds by committing suicide.