There are many ways that we measure a person’s personality. Zodiac sign is one of the most common ways, when people use planets and stars based on date of birth to evaluate each person’s personality. The aura around each person is another way, as color is also a way to locate another person.
However, the Japanese chose another way – using blood type. Indeed, in the famous anime series of the land of cherry blossoms, filmmakers often use blood type to talk about human personality. A good example is in Lucky Star, the characters used to sit together to talk about blood type the same way we talk about destiny.
According to statistics from motto-japan, the use of blood type to determine personality began to appear around 1916, based on a study by Dr. Kimata Hara. It didn’t really become famous until 1925, though. Researcher Takeji Furukawa did his own research on whether a school test should assess a student’s personality and should accept a surname. or not. This theory became popular until the 1970s when Masahiko Nomi, a supporter of Furukawa’s theory, published their own book on blood types that determine personality.
Accordingly, blood type A is to talk about people who are extremely organized, neat, clean, shy and reliable. They are quiet people who like to do things for others, but are prone to stress. They are also the people people turn to for advice or to mediate. It can be said that the personalities of group A are good mediators and “reciprocal peacemakers”. Ami Mizuno, the sailor Mercury is a good example of this blood type.
Meanwhile, blood type B are creative, curious people who just want to learn, but they will break the rules in doing so. They can adapt and think outside of the box. They are also impulsive and unpredictable, quickly dropping things to no longer keep their preferences. Because of this, they are seen as irresponsible, reckless and somewhat outspoken. My Hero Academia’s beloved homeroom teacher, Shota Aizawa, falls into this category.
Next is group AB, which is a combination of the two previous personalities, bringing aspects of both. They are considered strange, aloof and hard to read. This blood type is not common in Japan, which makes them stand out even more. They have all the strengths of being outgoing and inquisitive, but they are also hesitant and unstable. Mikasa Ackerman in Attack on Titan is an example with AB blood type.
The last group is blood type O, which are considered natural leaders and “carry the prison and the general”, no matter what. Group O is rude, but they are not mean. These are people who are leaders and even work in important positions. They are very optimistic and often look at the positives of people, but have difficulty expressing themselves. Nico Robin in One Piece is a typical O group.