This is a great video by Dr. Ramani. All scary personalities to avoid, indeed. There are another group of dangerous personalities known as the Dark Triad. In psychology, the dark triad comprises the personality traits of narcissism, Machiavellianism, and psychopathy.
I like Psychology today too. Knowledge is power and understanding the dark traits in some of these people helps to see the red flags sooner rather then later. I also like the use of the DISC. This is a useful personality tool for use either in the workplace or for relationships. There's another fun test you can do online 16Personalities. My daughter and I were freakishly the same in personality on this test. We still laugh about it today because of one trait we have we do way too often.