Psychopath

A Psychopath is a person who is incapable of emotion and takes no responsibility for his/her actions. They often consider themselves grandiose or above others. Most psychopaths are highly intelligent, narcissistic, and may appear to be a "blank slate" when in the depths of their pathology.

Traits
As stated before, people of this personality disorder may display no empathy towards others and no remorse or guilt. However, they can mimic emotions almost perfectly to further their own personal agendas, are very skilled in the arts of deception, and may actually appear charming, friendly, or even likable. Some psychopaths will engage in severe antisocial behavior, such as murder (even serial or mass murder), animal cruelty, or sexual crimes.

Sociopath
A sociopath is a psychopath who may not display criminal behavior, but will display social deviance. Most sufferers of this disorder can only feel pleasure in the misfortune of others. They may feel the need for power and will feed off of the negative emotions (notably fear) of others. Many do, however, display criminal behavior, and sociopaths are among the worst of them. An outside observer may see a sociopath as "purely and simply evil".

Treatment
There are currently no medicinal treatments for psychopathy, and talk therapy only serves to further the ability to mimic emotions. There is believed to be a genetic propensity in the cases of psychopathy, as the trait appears to run in families. As a possible genetic disorder, there may never be an effective treatment.

Aggressive Narcissism

 * 1) Glibness/superficial charm
 * 2) Grandiose sense of self-worth
 * 3) Pathological lying
 * 4) Cunning/manipulative
 * 5) Lack of remorse or guilt
 * 6) Emotionally shallow
 * 7) Callous/lack of empathy
 * 8) Failure to accept responsibility for own actions
 * 9) Placing blame on others

Social Deviance

 * 1) Need for stimulation/proneness to boredom
 * 2) Parasitic lifestyle
 * 3) Poor behavioral control
 * 4) Promiscuous sexual behavior
 * 5) Lack of realistic, long-term goals
 * 6) Impulsiveness
 * 7) Irresponsibility
 * 8) Juvenile delinquency
 * 9) Early behavioral problems
 * 10) Revocation of conditional release

Criminal Minds

 * Adrian Bale
 * Nathan Harris
 * Frank Breitkopf
 * George Foyet
 * Danny Murphy
 * Ray Campion
 * Raymond Donovan and Sydney Manning
 * Greg Phinney
 * Randy Slade

Other Fiction

 * Norman Bates (Psycho)
 * Diogenes Pendergast (Preston-Child series of novels)
 * Dexter Morgan (Dexter series of novels) is a self-proclaimed sociopath
 * In the BBC drama Sherlock, Sherlock Holmes is labelled a psychopath, to which he replies, "I am a high-functioning sociopath."

Real World

 * Eric Harris
 * Jeffrey Dahmer
 * Charles Manson
 * Ted Bundy