These characters exhibit an inability to empathize with others and a lack of remorse characteristic of psychopathy.
Colonel Walter E. Kurtz (probably the result of post-traumatic stress disorder)
Lestat de Lioncourt
Antisocial but not Fully Sociopathic
These characters exhibit antisocial characteristics but also show some degree of remorse and empathy (albeit, in some cases it is very limited).
Gregory House (motivated by narcissism; Gregory is probably psychopathic on the Hare Checklist)
Buck Strickland (possibly more on the sociopathic spectrum)
Walter White (may be veering more towards psychopathy)
Border Line Personalities
These characters exhibit an unstable self-image; are prone to negativity, black and white thinking, paranoia, delusions, and dissociative or psychotic breaks.
These characters are pathologically self-obsessed and share some traits with psychopaths such as inconsideration for others, shallow affect, and are sometimes callous or unemotional in the face of any grief they cause.