Blood-type personality (ketsueki-gata)

Ketsueki-gata is the popular East Asian belief that a person's ABO blood type shapes their temperament. Popularised in 1970s Japan by Masahiko Nomi, it sorts people into four personality profiles corresponding to blood types A, B, AB, and O.

A popular belief in Japan and Korea with no scientific support; controlled studies find no reliable link between ABO blood type and personality. (Masahiko Nomi, Japan, 1970s (building on earlier 1920s ideas by Takeji Furukawa))

Groups

• Type A — Stereotyped as earnest, organised, and reserved, yet prone to anxiety and a strong sense of responsibility.
• Type B — Stereotyped as creative, individualistic, and passionate, with an unconventional and free-spirited streak.
• Type AB — Stereotyped as rational, adaptable, and complex, while remaining private and somewhat hard to read.
• Type O — Stereotyped as confident, sociable, and ambitious, with a resilient and goal-driven outlook.

Related topics

• Dominant chakra
• Palmistry hand type (chiromancy)
• Human Design type
• Ayurvedic dosha (Prakriti)
• Five-Element constitution (TCM)

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