5. I don't know, sorry. I personally feel that you can be born one and just not know it until something happens in your life where it kind of comes out and makes itself known.
A little explanation for the answers besides 5- Look at what happened in Columbine. Even though it happened over 20 years ago, both Dylan and Eric still have a good sized fan base. Those who look up to them somehow connect with them on a personal level, given their history, the true event and so on. For 4 however, I think pretty much everyone has a personal definition of a psychopath and it if you do get diagnosed with psychopathy, it can vary from person to person.
The element that is most likely to be featured in a work of realistic fiction is "well-defined character suggested by actual experience." This would provide the most realistic character.
