Know your personality based on your blood type

Type O

Strongly purpose-oriented
Straight desire
Conscious of power relationship
Know how to take chances
Dislike to be subordinate
Romantic-natured
Realistic judgment and action
Straight-line thinking
Strong fellow feeling
Personal contact
Extremely cautious to non-fellows
Prefer individualistic things
Self-assertion and Self-expression
Great command of language
Act on the basis of fundamental rules
Control one's feeling easily
Strongly conscious of the society
Straightly show one's feeling
Expressive

People with blood type O people are outgoing, energetic and social. They are the most flexible of the blood types. They easily start up projects but often have trouble following through because they give up easily. They are flighty and not too dependable. O types always say what's on their mind. They value the opinion of others and like to be the center of attention. Also, people with O blood are extremely self-confident.

Type O, the most "average" blood type, is considered the best type in Japan.

Quatre, Sailor Moon, Saito Hajime, Kamiya Kaoru, Tamahome

Type A

Considerate about everything
Prefer peaceful human relations
Slow to trust people
Observe social rules and customs
Regard social order as important
Restrain action and expression
Apt to think conventionally
Pessimistic about the future
Tries to be optimistic about the past
Perfectionist
Endure continuous effort
Weak at maintaining the status quot
Weak at keeping continuous and intensive interest
Emotional wounds heal slowly
Strong desire for transformation
Seek one's reason Dieter
Make a distinction between right and wrong
Attentive to one's own security
Less expressive than Type O and Type B
Anxious

People with blood type A have a deep-rooted strength that helps them stay calm in a crisis when everyone else is panicking. However, they tend to avoid confrontation, and feel very uncomfortable around people. A types are shy and sometimes withdrawn. They seek harmony and are very polite, but all the same feel that they never really fit in with others. A types are very responsible. If there is a job to be done, they prefer to take care of it themselves. These people crave success and are perfectionists. They are also very creative, and the most artistic of all the blood types, most likely because of their sensitivity.

People with blood type A are also likely to be considered classic "type A's": stressed and conscientious. In anime, people like Hotohori are type A's.

The Third Hokage, Haruno Sakura, Hotohori, Heero Yui, Keiko (Kayko) Yukimura 

Type B

Dislike restrictions and one's own way
Non-stereotyped action
Non-stereotyped thinking
Self-conscious and not warped expressions
Makes less distinction of things
Not conscious of circumstances
Don't care social rules and customs
Rapid action
Judge by correctness
Pragmatic and Objective thinking
Continuous, intensive and wide-ranging interest
Apt to stick to the past
Optimistic about the future
Straightly show one's feeling -- less than Type O and more than Type A and AB
Emotional wounds heal fast and completely
Less domestic inclination
Life which give the priority to one's interest
Easily absorbed to the one's interests
Not very ambitious -- less than Type O and A, more than Type AB

People with blood type B are the most practical of the blood groups. They are specialists in what they do. When they start a project, they spend extra time understanding and trying to follow directions than others might. When they are doing something, all of their attention is focused on it. They tend to stick to a goal and follow it through to the end, even if it seems impossible. They tend to be less than cooperative, as they like to follow their own rules and their own ideas. They are individualists. B type people pay attention to their thoughts a little more than their feelings, and therefore can sometimes seem cold and serious.

People with blood type B are often considered more relaxed, freewheeling, and unconventional than other types, although not necessarily to an unacceptable degree. In anime, the genki, off-the-wall types are type B, along with any kind of well-intended character who's ruled by their impulses.

Naruto, Duo Maxwell, Miaka, Nuriko, Tasuki, Sagara Sanosuke

Type AB

Rational thinking
Good critic and analyst
To participate and contribute to the society -- by obtaining a role
Good at adjusting human relations
Hope to be in harmony with the society and the people
Ask other people's opinions to decide important questions
Control one's feeling socially
Inwardly emotional
Feels distant from the society
Dislike hypocrites
Intensive but not continuous interest
Consider problems from many other angles
Fairy-tale and fanciful traits
Not absorbed to anything
Rational economic life
Steady life
Avoid power struggle
Tries to treat people fairly
Least expressive of all
Have less attachment to one's life

People with blood type AB are hard to categorize. They can have characteristics on both ends of the spectrum at the same time. For instance, they are both shy and outgoing. They easily switch from one opposite to another. AB people are trustworthy and responsible, but can't handle it when too much is asked of them. They don't mind doing favors or helping out, as long as its on their own conditions. People with this blood type are interested in art and metaphysics.

AB is considered the worst blood type. In predictability-loving Japan, they're loose cannons. They also like to set their own conditions and reserve the right to drop out when things don't meet their expectations. They're known to be sensitive and considerate—at times—but it just isn't enough to balance out the flaws in this blood type. For a while, some companies tried dividing their employees into work groups based on blood type, and no one wanted to work with the AB group. Anime villains are likely to be type AB.

Uchiha Sasuke, Hongo Yui, Tomo, Trowa Barton, Kenshin