Japanese Blood Types : What they say about your personality


In Japan, blood types are considered an important indicator of a person’s personality.


It’s known as the “Japanese Blood Type Personality Theory.” It’s common for people to ask your blood type in Japan as this is widely believed to be a marker of personality.

This idea is based on studies published by Japanese scientists beginning in the 1920s that are widely considered pseudoscience.


In the past, the idea was taken seriously in Japan with people seeking friends or dating partners according to their blood type.

The idea has resulted in serious cases of discrimination such as bullying or unequal access to employment. About 2/3 of people in Japan say that they believe in an association between blood type and personality.


Of course,

In recent times, blood type is mostly viewed in a lighthearted way, much like horoscopes. For example, it’s possible to find novelty products for your blood type such as bath salts or look up your blood type horoscope in gossip magazines.

The average person in Japan doesn’t take the concept too seriously.


By the way, do you know what blood type you are? What about the blood type of everyone in your family?

If you are planning on visiting Japan or interacting with Japanese people, read on.You’ll find out where these beliefs came from and why it has such a hold on the Japanese consciousness.




Japanese Blood Type Personality Theory



🔴  Blood Type A

Most of the Japanese population is type A. People with this blood type are described primarily as well-organized. They like to keep things neat but can be stubborn and get stressed out easily.

They also value harmony with others. Agricultural people are the root of blood type A, and it’s been said working collaboratively on farms developed these blood type personality traits.


Attentive, Composed, Conscientious, Diligent, Earnest, Intense, Kind, Mild-mannered, Neat, Patient, Polite, Reliable, Responsible, Tactful, Wary, well-organized・・・

Anxious, Fastidious, Indecisive, Nervous, Reserved, Sensitive, Shy, Stressed, Stubborn, Tense, Timid, Perfectionist, Withdrawn・・・



🔵  Blood Type O

Blood type O is often described as optimistic. They are outgoing, have leadership abilities, and are able to set the mood for groups of people. They don’t care much about little things, so their behavior sometimes freaks out more sensitive A types.

Though they’re often late to events (and sometimes rude), O types are incredibly resilient and flexible, enabling them to roll with the punches.


Agreeable, Ambitious, Calm, Confident, Energetic, Flexible, Impressionable, Independent, Intuitive, Leadership-Ability, Optimistic, Outgoing, Passionate, Peaceful, Realistic, Self-determined, Social, Strong-willed, Trendsetter・・・


Carefree, Easygoing, Emotional, Insensitive, Rude, Self-centered, Unpredictable, Unpunctual, Vain・・・ 



🔴  Blood Type B

Blood type B is generally described as selfish. They are also known for their creativity. Blood type B has a strong sense of curiosity, but at the same time, loses interest easily.

Though there are a lot of positives to B types, people tend to focus on the negatives for reasons we’ll get into later. Some say their root is in nomadic peoples who roamed from place to place.


Active, Adventurous, Cheerful, Creative, Flexible, Outgoing, Passionate, Pragmatist, Relaxed, Strong, Unconventional, Wild・・・

Curious, Irresponsible, Selfish, Uncooperative, Unforgiving, Unpredictable・・・



🔵  Blood Type AB

Blood type AB is a hybrid of A and B, two different personalities mixed together. They are often seen as dual-natured and complicated. For example, they are shy like A types, but also are outgoing like type B.

Blood type AB is the rarest in Japan (and many other places in the world, too), so they are hard to find. This reinforces the stereotype that AB people are are eccentric.


 Adaptable, Artistic, Calm, Charming, Composed, Creative, Diplomatic, Outgoing, Rational, Sociable, Talented, Trustworthy, Popular, Proud・・・


Complicated, Cool, Dream Chaser, Eccentric, Forgetful, Impatient, Irresponsible, Mysterious, Self-centered, Sensitive, Spiritual, Two-faced, Vulnerable・・・





Blood Type Personality Compatibility

You might be wondering which blood types get along with each other.



★  A × A

These similar personalities generate empathy and affection, but sometimes create irritation because both people are so intense.


☆  A × O

Type A and Type O have very different personalities (A is sensitive, but O is not). They cover each other’s weaknesses, but the differences may stress them out.


★  A × B

Type A envies Type B’s ability to enjoy things at their own pace. Type B is uncomfortable with A’s doting. The kindness feels intrusive.


☆  A × AB

This combination depends on the individuals. AB is part A and part B. Type A wouldn’t get along with an AB who is too strong on the B side (meaning they’re self-centered). However, they can build a stable relationship, if the person is an A-ish AB.





★   O × O

Though their honest attitudes can build a frank and open relationship, they tend to collide with each other when it comes to competition.


☆  O × B

Type O is patient and they can enjoy and support Type B’s free wheeling personality. A good pairing!


★  O × AB

Type O are straightforward and honest, so they may have a hard time understanding AB’s complexity at first. But, Type O is resilient and can be supportive, especially when Type AB is facing adversity.





☆  B × B

This can be the best combination when their preferences and pace fit one another. But if they don’t, this pairing could be the worst.


★  B × AB

Type B likes to take time to do things and Type AB values privacy. These two naturally respect each other’s wishes. They’ll have a good relationship as long as they don’t get in each other’s way.


☆  AB × AB

Type AB is pretty rare, so two ABs find a strong connection and affection for each other. They can understand the other’s complex and unique personality more than anyone else, so the relationship can get intense.





Congenial Ranking ☆


《 Best 》

  1.  O (Man)   &   A  (Woman)
  2.  B (Man)   &   AB  (Woman)
  3.  A (Man)   &   O  (Woman)
  4.  A (Man)   &   A  (Woman)
  5.  B (Man)   &   O  (Woman)


Do you know any couples who fit these pairs? If so, you might get a wedding invite pretty soon.



《 Worst 》

  1.  O  (Man)      &   AB  (Woman)
  2.  A  (Man)      &    B  (Woman)
  3.  AB  (Man)   &    O  (Woman)
  4.  O  (Man)     &    O  (Woman)
  5.  B  (Man)     &    B  (Woman)





What’s your blood type?

Japanese people love to ask the question. “What’s your blood type?” Is that because they are concerned about your health? Are they worried that you might need a blood transfusion?

No! It is because many of them believe that blood type determines your personality, temperament, and compatibility with others.


I wish more studies on this subject will be done ☆