Blood Type

Along with the Japanese Zodiac, the ABO blood type is widely used in Japan to understand a person’s temperament and personality. It’s a popular belief that people in the same blood groups have similar personality traits.

Based on the ABO blood group system, type A and type O accounts for about 40% and 30% of the Japanese population respectively, while type B and type AB are only 20% and 10%. The personality traits associated with each blood type are:

Type A

Positive: Earnest, sensible, reserved, patient, perfectionism
Negative: Over-sensitive, anxious, tense

Type B

Positive: Creative, flexible, active, cheerful
Negative: Selfish, arbitrary, eccentric

Type O

Positive: Optimistic, generous, strong-willed, confident
Negative: Stubborn, self-centered, irresponsible

Type AB

Positive: Cool, rational, sociable, creative
Negative: Unpredictable, split personality, indecisive