Blood Type Compatibility Chart
A 4×4 read-across of how Japanese pop culture pairs the four blood types — with a short note on each combination.
For entertainment only. Blood type compatibility (ketsueki-gata aishō) is a popular Japanese cultural belief and is not supported by science. Please don’t use it to make real relationship decisions.
| Type A | Type B | Type O | Type AB | |
|---|---|---|---|---|
| Type A | Steady Comfortable but risk-averse — both tend to wait for the other to move. | Tricky Opposites: A wants routine, B wants novelty. Works with real communication. | High Classic pairing — A brings care, O brings decisiveness. Rarely fights. | High A’s attentiveness reads AB’s moods well. Quietly deep. |
| Type B | Tricky Same as A × B, seen from B’s side. B’s spontaneity can unsettle A. | Steady Fun but scattered — neither wants to be the responsible one. | Steady Warm friendship, workable romance. O anchors, B improvises. | High Creative fit — both like weird ideas. Watch for two moving targets. |
| Type O | High Same as A × O, seen from O’s side. Steady and generous. | Steady Same as B × O. Balances big energy with steady footing. | Steady Strong when goals align; competitive when they don’t. | Steady O leads, AB observes and edits. Complementary if O gives space. |
| Type AB | High Same as A × AB. Quietly warm. | High Same as B × AB. Two originals — needs shared rituals. | Steady Same as O × AB. O’s directness helps AB open up. | Steady Deep mutual understanding — but with so little friction that neither one pushes the other to grow. |
Read down the left column for “you,” across the top row for the other person. Levels are labels from popular belief, not measurements. Note is intentionally short — details go to the individual type pages.
How to read this without doing harm
Ketsueki-gata compatibility is a real part of Japanese social life — in dating apps, magazine quizzes, and small talk. It is also the source of bura-hara (blood-type harassment), the recognized problem of people using blood type to reject partners, judge coworkers, or type-cast children. If you enjoy the chart, enjoy it as folklore. Don’t use it to break up with anyone.
Where the pairings come from
The classic mapping used by most Japanese pop sources reads roughly like this: Type A pairs smoothly with warm, decisive Type O, and finds a considerate mirror in Type AB. Type B’s spontaneity clicks with Type AB’s originality. Type O anchors almost everyone. Type AB shifts between the A side and B side, and reads other people better than they’re read.
None of that is a scientific claim. It’s a stylised cast list — one that a lot of Japanese readers happen to enjoy discussing.