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See, in anime, a characters blood type determines their personality and traits. Its just one of those Japanese beliefs that has worked its way into anime.
Type A
This type is calm, obedient, sensitive, cautious, serious, careful, and often values their interpersonal relationships. They are often polite, studious and discliplined, and tend to be empathic and self-sacrificing. This personality type will often be indecisive, introverted, nervous, and detached, and may have a tendency to be hesitant to express their feelings.
Type B
This type tends to have a strong personality and is usually optimistic, adventurous, and easy-going. This perosonality is usually outgoing, friendly, sensitive and kind, but has an inclination to be forgetful, disorganized, noisy and spontaneous. Type Bs may also be undecisive and prone to exaggeration.
Type AB
The Type AB personality is often a very critical personality, but they try to be useful and are often very aware of their environments. They are diplomatic, proud, efficent and quick learners, but they tend to be delicate, short-tempered and dependent. This type may also be moody or brooding, and maybe a bit too serious about themselves.
Type O
This type is romantic, proud and organized with a strong sense of purpose. Warriors tend to be confident, judgemental, strong-willed and dedicated. They also have an inclination to be over-confident, self-centered, stubborn, insecure and, often, workaholics.

Anime Blood-tyopes provided by Manga-Anime Online.