A person’s personality characteristics correspond to that person’s behavior relevant to their relationships with other people.

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Interpersonal personality characteristics are defined as personality characteristics that are necessary and sufficient for:

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1. Mutually beneficial relationships between two people, and

2. The biggest benefit for all people everywhere.​

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Examples of interpersonal personality characteristics are empathy, remorse, and respect for the boundaries of other people.

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Complementary personality characteristics are defined as personality characteristics that are the complete and total absence of each of the interpersonal personality characteristics.

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Examples of complementary personality characteristics are no empathy, no remorse, and no respect for the boundaries of other people.

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A person with complementary personality characteristics, by definition, is incapable of ever having relationships with other persons that are both mutually beneficial and which lead to the biggest benefit for all people everywhere.

 

There is diversity in the distribution of the interpersonal and complementary personality characteristic spectrums in people in the same way there is diversity in eye colour, hair colour, skin colour, height, face shape, gender, scholastic potential, athletic potential, etc.

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A person with interpersonal personality characteristics can never know the perspective of a person with complementary personality characteristics, and vice versa. For example, a person with empathy cannot empathise with a person who cannot, and a person without empathy cannot empathise with a person who can.

 

Some examples of interpersonal personality characteristics and complementary personality characteristics include those in the following table. 

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