A psycho is someone who has serious mental problems and who may act in a violent way without feeling sorry for what they have done. Psychopathology is characterized by an extreme lack of sympathy .Psychopaths may also be manipulative, charming and exploitative, and behave in an impulsive and risky manner. They may lack conscience or guilt, and refuse to accept responsibility for their actions. -Common signs of psychopathy socially irresponsible behavior. disregarding or violating the rights of others. inability to distinguish between right and wrong. difficulty with showing remorse or empathy. tendency to lie often. manipulating and hurting others. recurring problems with the law.