Che Guevera was was an INFJ.Not that I want to myself, but several online descriptions talk about how an ENFP would be manipulative if they went to the "dark side." Not to mention that some of the most bloodthirsty killers in history such as Che Guevara were widely purported to be ENFPs themselves.
This has actually been bothering me for a while. How would ENFPs even test as Fs in the first place if they were so fucked up as people? The questions on MBTI surveys that determine whether you're an F or a T are the ones that say things like "how sympathetic are you to other people" or "do you tend to provide emotional support" or other similar questions. How do people with seemingly no conscience or regard for other human life such as Hitler (INFJ) indicate a preference for Feeling over Thinking? Would an ENFP that goes over to the "dark side" still be an "ENFP"? Such a change of personality would have to mean a sort of abandonment of one's ideals or conscience.