Ketsueki Gata - Personality based on Blood Type

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Just as there are people who believe in horoscopes and that their personality is determined by their zodiac sign, in Japan it works differently. Instead of a horoscope, the Japanese believe that personality is determined by the person's blood type (Ketsueki cat).

Ketsueki Gata - Blood Types

In Japan, blood types are considered an important indicator of a person's personality. It is known as the "Blood Type Personality Theory".

Although this is more of a superstition, many people believe it. In fact, research in Japan shows that 29% of men and 45% of women believe in this "theory".

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In Japan, the personality determined by blood type is called Ketsuekigata seikaku handan (血液型性格判断), the horoscope involving the blood type is called Ketsueki cat uranai (血液型占い).

In addition to personality, some believe that blood type can affect temperament and even compatibility in romantic relationships.

Perhaps this is one of the main reasons that idols, celebrities, anime characters, manga and games have their blood type highlighted in some referring publication. Everything to make otakus love yours even more waifus.

Ketsueki gata - personalidade baseada no tipo sanguíneo

Blood type personalities in Japan

Below we will see a small summary and quick description of blood types in Japan. There are books and complete materials specialized only in one blood type, the material created involving blood types is gigantic as are the horoscopes that receive daily predictions.

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Type A

Most Japanese are blood type A. According to the theory, people of this blood type are organized, intense, detailed, rational, reserved, educated, trustworthy, patient, responsible and perfectionist.

On the other hand, type A people are shy, obsessive, sensitive, obtuse, orthodox, stressed, distant, stubborn and exaggerated.

Type B

Type B people are considered passionate, relaxed, cheerful, outgoing, adventurous, curious, unconventional, carefree, active, flexible, unpretentious and creative.

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On the other hand, they are selfish, irresponsible, immature, unpredictable, erratic, indecisive, unforgivable, uncooperative and lazy.

Type AB

Type AB people are said to be eccentric, behaved, moderate, artistic, sociable, mysterious, charismatic, popular, adaptable, diplomatic, talented and spiritual.

On the other hand, they are prejudiced, impatient, complicated, forgotten, petty, hypocritical, vulnerable and distant.

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Type O

Type O people are seen as optimistic, confident, devout, ambitious, athletic, sincere, loyal, conceited, independent, influential, idealistic and intuitive.

On the other hand, they are cold, cruel, impolite, envious, insecure, arrogant, imitators, without commitment, authoritarian and inflexible.

Where did this blood type theory come from, after all?

In 1927, psychologist Takeji Furukawa was a professor at a women's school linked to a university. He began to question the school's enrollment system, which was based on academic ability. He wanted a system that also considered the candidates' personalities.

After World War II, discussions about the blood typing theory disappeared for some time. But in the 1970s, a journalist named Masahiko Nomi, influenced by Takeji Furukawa, published a book on the relationship between blood types and personalities. This book has become a bestseller and helped spread the theory more widely.

The trend slowed considerably in the 2000s due to movements that were against this theory. So, even though people's personal thoughts about blood type personalities are still quite strong, there aren't as many media outlets about it as before.

Ketsueki gata - personalidade baseada no tipo sanguíneo

Blood type curiosities

Like the Horoscope and similar things around the world, the blood type in Japan receives a variety of materials on the subject. Books, magazines, newspapers, TV shows, campaigns and personal interpretations. Even Facebook joined the wave and allows the Japanese to put their blood type on the profile.

Discrimination based on blood type - Incredibly, Japanese people can discriminate or even form an opinion without knowing it more deeply based on the person's blood type. Sometimes, fanaticism is so great that this act of discrimination even got a name. Burahara (ブラハラ) is the name of this social phenomenon that judges others because of their blood type.

Blood Types in Japanese

Now let's talk about blood in the Japanese language. Here you will learn how to say your blood type in Japanese, ask or read about it. Below is a list of words related to blood:

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PortugueseJapaneseRomaji
Bloodchi
Liquid, Fluideki
Type, modelkata
Blood (scientific term)血液ketsueki
Blood Type血液型Ketsuekigata
HRアールエッチaaruecchi
THEエー and is
Bビーbii
Oオー oo
Formula / type (suffix = A)shiki
Negative陰性I entered
Positive陽性yousei
  • [血液型は何ですか] - What is your blood type?
  • 私の血液型は O 型 Rh (+) です - My Blood is The Positive;

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