Mentally Ill Villains have a type of psychological disorder and can be deemed as mentally unstable, or any villain suffering from mental disorders such as schizophrenia and psychosis. In addition, a villain who is perfectly coherent and stable can still be qualified as mentally ill if the evil deeds they perform are extremely fiendish and malevolent, the reason being that no sane individual would think it acceptable to take villainy to the degree that they do.

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