Personality disorders tend to have similarities and as such are grouped together according to their key characteristics.
People with personality disorders which fall into the Eccentric Characteristics category often appear to be extremely different, peculiar and strange to others.
These include:
1. Paranoid Personality Disorder – This person tends to interpret the actions of others as threatening.
2. Schizoid Personality Disorder – This individual is detached from social relationships, and shows a narrow range of emotional expression in various social settings.
3. Schizotypal Personality Disorder – This one is uncomfortable in close relationships, has thought or perceptual distortions, and peculiarities of behavior.
Next are the folks with up and down mood swings, impulsivity and erratic behavior, including acting out and acting without thinking through consequences.
1. Antisocial Personality Disorder – A person may demonstrate a pervasive disregard for, and violation of, the rights of others.
2. Borderline Personality Disorder – People who exhibit a generalized pattern of instability in interpersonal relationships.
https://www.empowher.com/personality-disorders/content/personality-disorders