血液型を初対面で聞くのはドラマの定番です。四タイプは覚えやすい流行語であり、性格検査ではありません。
The skeleton of blood-type personality writing was assembled in 1920s–30s Japanese popular psychology and magazines; postwar weeklies locked the four types. Korea absorbed the frame with Japanese pop culture from the 1990s, recycling it as blood-type compatibility lists and idol features. Four slots are easy to memorize and easy to project onto yourself. Easy is not accurate.
Studies that split personality, IQ, or job fit by ABO usually fail replication or show tiny effects. Blood type matters for transfusion matching and some infection epidemiology — that is hospital territory. It does not map onto Big Five traits. “They act so B” is textbook confirmation bias.
Some posts “double-check” ABO against a day stem or sun sign. The inputs are different: genetics, sexagenary calendar, and the tropical zodiac. Stacking them does not raise accuracy. Playing with all three as language is fine; putting blood type on a job form or a dating gate is closer to bias than to insight.
Do not assign team roles, cut romantic chances, or forecast illness by type. Transfusion, pregnancy, and screening follow medical protocol. This site’s A/B/O/AB character pages are entertainment sketches. If you want personality data, a self-report inventory or a counselor is more honest than an antigen.
| A | Careful / rule-loving catchphrase. Shy formula is a fad. |
|---|---|
| B | Free-spirit catchphrase. Selfish formula is bias. |
| O | Outgoing leader image. Type is an antigen. |
| AB | Genius / split image. The most mythical box. |
Entertainment and culture. Not a forecast.
For entertainment and cultural context. Blood-type tropes, palmistry, and luck lore are not prediction, finance, medical, or legal advice.