Sometimes a sychological weakness can hurt others. I am currently writing a story where one of the characters has a psychological weakness that has caused him to hurt others in the past. There's nothing wrong with him morally, which is why he isolated himself in order to keep from hurting anyone else. His want. His Need however, is friendship.
Oh my gosh thank you! I think this helped me just put the cherry on top of my villain, and helped me with trying to give my hero motivation. http://www.weightlossjumpstars.com/self-motivational-weight-loss-books/
This infographic gives brief summaries of the 12 Jungian personality archetypes, for use when building charcaters. As with any writing tools, archetypes are really most useful if you think of them as a starying block - you cannot simply reduce people to 12 options. Most people will show traits from multiple categories. As a writer, you may want to think about each character's primary and secondary archetypes. As always, remember: Tools, not rules!