"Type O people are good at finding ways to satisfy basic human needs, meaning they have good survival instincts or skills," Ichikawa said. "They are keen to find out what their position, role or expectation is within a group. With that knowledge, they come up with ways to survive within that group."
Famous Type O's include Al Capone and Charlie Chaplin.
Type A: Methodical, organized and responsible. Self-restrained. Places importance on order, formality and stability. Sensitive to changes in surroundings or environment.
"Type A tends to think of oneself in relation to others and his/her surroundings," Ichikawa said. "They often pay attention to how their action/behavior can affect or relate to society."
Famous Type A's include Robert Kennedy and Meg Ryan.
Type B: Seeks freedom. Values independence and practicality more than community and order.
"Type B focuses on what he/she is interested in," Ichikawa said. "Other types may be driven by societal norms or morality but the driving force for Type B is the source of interest. This does not mean they do not pay attention to societal needs, but they often may be viewed as self-centered or unconventional."
Famous Type B's include Jack Nicholson and Johnny Depp.
Type AB: Rational thinker -- shows sometimes conflicting dispositions of Type A and Type B.
"Qualities of Type A and B often have a dialogue in the minds of Type AB," Ichikawa said. "They often seek balance between the two. This process is often not easily understood or recognized by others. So Type AB can be described as mystical or an owner of a split personality."
Famous Type ABs include John F. Kennedy and Marilyn Monroe.