NinjibotBlood Type
In Naruto, blood types work differently than in the real world — there is no + or −. There are only four known blood types, and they have a heavy influence on a character's main personality traits. Use this guide when developing your OC.
The Four Blood Types in Naruto
Canon character personalities align with these four types. Picking a blood type for your OC can help keep their traits consistent with the series.
Type B
Most characters have this blood type.
Hate to lose; uninhibited; often cheerful, but impulsiveness gets them into trouble.
Examples: Naruto, the Three Sannin, Minato, Suigetsu
Type A
Second most common among characters.
Great fortitude; often fastidious.
Examples: Hinata, Sai, Rock Lee, Shizune
Type AB
Cool-looking but can be aggressive.
Cool exterior; can be aggressive at times.
Examples: Sasuke, Itachi, Karin, Deidara
Type O
Not too many have this blood type.
Usually easygoing and calm.
Examples: Sakura, Kakashi, Iruka, Konan
Japanese Blood Type Personality Theory
In Japan, blood type is often used like zodiac signs elsewhere: people ask about it as a conversation starter, and many believe it hints at personality. The four types are associated with broad stereotypes:
- Type A (around 40% in Japan): organized, detail-oriented, perfectionist, good in teams; can seem anxious or stubborn.
- Type B (around 20%): creative, passionate, individualistic; often seen as cheerful and outgoing, sometimes selfish or eccentric.
- Type AB (around 10%): complex, artistic, rational, adaptable; sometimes viewed as indecisive or mysterious.
- Type O (around 30%): confident, resilient, natural leaders; outgoing and optimistic, sometimes self-centered or unpredictable.
These associations are cultural belief, not science — studies have not found real links between blood type and personality. In Naruto, the series uses the same four-type system and ties it directly to character traits, so for OC development it's a useful in-universe framework.
References
Blood types and personality descriptions in Naruto are from the series and databooks. The Japanese blood type personality theory is a well-known cultural phenomenon; this page is for fan use when creating OCs.