What's your blood type

Japan’s culture of blood types is widely popular in women’s magazines as a way of determining relationship compatibility with a potential or current partner. It is also common among anime and manga authors to mention their character’s blood types, and to give their characters corresponding blood types to match their personalities
Although there is no actual scientific proven between blood type and personality, it remains popular with the many dating services that cater to blood type. In this way, it is similar to the use of astrological signs in the west, which is also popular in Japan. Asking one’s blood type is common in Japan, and people are often surprised when a non-Japanese does not know his or her own blood type.

Where did this idea comes from..

The idea of a correlation between blood type and personality was first noted in the 1930s during Japan’s invasion of eastern Asia. Military leaders commissioned a study on how blood type influences personality in an effort to breed better soldiers.
The war ended, but the concept of a link between blood type and personality remained fixed in the minds of Japanese. Today it is held to be mostly a kind of party game, but there is an underlying seriousness of belief.
Medical experts have insisted for years that there is no scientific correlation between character and blood type, but to no avail. Many Japanese remain hookedon the idea. “It’s a modern superstition,” said Hiroyoshi Ishikawa, a professor of social psychology at Seijo University. “But it’s also a powerful social lubricator. Talking about blood type is the easiest way to establish contact with a stranger.”
Type A
People with blood type A have a deep-rooted strength that helps them stay calm in a crisis when everyone else is panicking. However, they tend to avoid confrontation, and feel very uncomfortable around people. A types are shy and sometimes withdrawn. They seek harmony and are very polite, but all the same feel that they never really fit in with others. A types are very responsible. If there is a job to be done, they prefer to take care of it themselves. These people crave success and are perfectionists. They are also very creative, and the most artistic of all the blood types, most likely because of their sensitivity.

Type B
People with blood type B are the most practical of the blood groups. They are specialists in what they do. When they start a project, they spend extra time understanding and trying to follow directions than others might. When they are doing something, all of their attention is focused on it. They tend to stick to a goal and follow it through to the end, even if it seems impossible. They tend to be less than cooperative, as they like to follow their own rules and their own ideas. They are individualists. B type people pay attention to their thoughts a little more than their feelings, and therefore can sometimes seem cold and serious.
People with blood type B are often considered more relaxed, freewheeling, and unconventional than other types, although not necessarily to an unacceptable degree.
Type O
People with blood type O people are outgoing, energetic and social. They are the most flexible of the blood types. They easily start up projects but often have trouble following through because they give up easily. They are flighty and not too dependable. O types always say what’s on their mind. They value the opinion of others and like to be the center of attention. Also, people with O blood are extremely self-confident.
Type O, the most “average” blood type, is considered the best type in Japan.
Type AB
People with blood type AB are hard to categorize. They can have characteristics on both ends of the spectrum at the same time. For instance, they are both shy and outgoing. They easily switch from one opposite to another. AB people are trustworthy and responsible, but can’t handle it when too much is asked of them. They don’t mind doing favors or helping out, as long as its on their own conditions. People with this blood type are interested in art and metaphysics.
AB is considered the worst blood type. In predictability-loving Japan, they’re loose cannons. They also like to set their own conditions and reserve the right to drop out when things don’t meet their expectations. They’re known to be sensitive and considerate—at times—but it just isn’t enough to balance out the flaws in this blood type. For a while, some companies tried dividing their employees into work groups based on blood type, and no one wanted to work with the AB group.
Compatibilities
A is most compatible with A and AB.
B is most compatible with B and AB.
AB is most compatible with AB, B, A, and O.
O is most compatible with O and AB.

What others have to say about your blood type

Matchmaking agencies that arrange marriages often use blood type to weed out partnerings thought to have no potential. In tabloids, blood type is used to predict the fortunes of celebrities, and it’s the most vital statistic in profiles of up-and-coming stars.

“I would never develop a long-term relationship with a B,” said Yoshiko Yamazaki, a boutique owner with type A blood. “They’re so tiresome. B’s tend to be sloppy, so I’d always have to clean up after their dirty underwear.”

Beliefs of this kind spill over into many areas. An issue of bea’sUP, a women’s magazine, carried this headline on its cover: “EVERYTHING YOU NEED TO KNOW ABOUT THE BLOOD TYPE DIET.” The article says that, in the old days, “O’s were a race of hunters, while A’s and AB’s were farmers.” The article goes on to conclude that some are suited to a low-calorie, meat-based diet, while others will be healthier sticking with a diet rich in vegetables.
The belief in blood type even shows up in employment. “A number of company owners have asked us only to send applicants of a particular blood type,” said Naoto Saito, an employee of Nihon Manpower, a job placement center.

“They claim they’ve noticed a marked tendency for, say, A people to get along well with O people.”

One’s type can even be an occupational hazard.

“Fashion is an overwhelmingly B-dominated industry,” complains boutique owner Yamazaki.

According to the Japan Red Cross Central Blood Center, about

40 percent of Japanese have type A blood, 30 percent are O, 20 percent are B and 10 percent have AB.