Teru Mikami ?C Death Note
[ranking: 6]
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.
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Gaara ?C Naruto
[ranking: 15]
Naruto has a plethora of disturbed characters to choose from, but one of the most memorable has to be Gaara. Like Naruto, Gaara had a tailed beast sealed inside him at birth. Unlike Naruto, Gaara's develops a taste for murder. After a childhood filled with attempts on his life by his father and his uncle, Gaara went on the defense. Not only did he kill to protect himself, he also killed to mask his own loneliness and feel alive.
However, Gaara eventually calms down, stops killing people, and ends up becoming the political leader of his entire nation.
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Johan Liebert ?C Monster
[ranking: 11]
Monster's main villain, Johan Liebert, is a morally bankrupt man who kills with a striking lack of passion. He doesn't enjoy killing, but he doesn't dislike it either. Little is known about his motives. A traumatic childhood could be to blame, but then viewers have to wonder why his sister, who experienced the same trauma, turned out to be a productive member of society.
Whatever the reason, Liebert wants to be the last man standing at the end of the world, and he is utterly incapable of feeling empathy or remorse.
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Moeka Kiry?? ?C Steins;Gate
[ranking: 12]
Moeka Kiry?? of Steins;Gate has severe difficulty with face-to-face communication and does all of her talking through her phone ?C even with people standing right in front of her. If her phone is taken away, she gets extremely agitated.
In response to the neglect and abuse heaped on her by nearly everyone she meets, Moeka becomes depressed, physically ill, and paranoid. When a less than scrupulous person does show her kindness, she's willing to do anything for him, including taking lives on his behalf.
Seryu Ubiquitous ?C Akame Ga Kill!
[ranking: 4]
Akame ga Kill! features the unstable Seryu Ubiquitous, who works for a crime-stopping squad on behalf of the emperor. Caring about crime comes with the territory, and it isn't necessarily a pathology ?C but in Seryu's case, it totally is.
Seryu's unshakable sense of black-and-white morality leads her to believe that the corrupt Empire she serves is flawless, and its enemies are pure evil. And in Seryu's mind, pure evil deserves to die, and she should get to enjoy herself destroying it. Her worldview doesn't allow for compassion or even access to reality.
Tatsuhiro Satou ?C Welcome To The NHK
[ranking: 14]
Tatsuhiro Satou of Welcome to the NHK is so mentally unstable, he has an entire anime dedicated to it. Satou is a shut-in who spends most of his time playing video games, masturbating, and otherwise avoiding the world. While the same could be said of a lot of anime characters, Satou takes it a step further.
As the series progresses, it becomes clear that Satou isn't living the NEET lifestyle out of laziness or incompetence. He's profoundly depressed to the point of being suicidal, and he's constantly hallucinating. In the original light novels, this was thanks to drugs, but because drugs are absent from the anime, one has to assume that it's a form of psychosis. That said, drug addiction is still a mental illness, so either way, Satou's mental stability is basically nonexistent, and he needs a lot more help than he gets from the manipulative Misaki.
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