Im interested about blood type personality these days.

Some people think blood type tells about personality. Legend has it that Type A is calm and trustworthy; Type B is creative and excitable; Type AB is thoughtful and emotional; and Type O is a confident leader.
http://www.factmonster.com/ipka/A0877658.html

Type O:
Type O’s are outgoing, and very social. They are initiators, although they don’t always finish what they start. Creative and popular, they love to be the center of attention and appear very self confident. 

Type A:
While outwardly calm, they have such high standards (perfectionists) that they tend to be balls of nerves on the inside. Type A’s are the most artistic of the blood groups. They can be shy, are conscientious, trustworthy, and sensitive.

Type B:

Goal oriented and strong minded, type B’s will start a task and continue it until completed, and completed well. Type B’s are the individualists of the blood group categories and find their own way in life.

Type AB:

Type AB’s are the split personalities of the blood groups. They can be both outgoing and shy, confident and timid. While responsible, too much responsibility will cause a problem. They are trustworthy and like to help others.

Compatibility by Blood Groups:
A is most compatible with A and AB
B is most compatible with B and AB
AB is most compatible with AB, B, A and O
O is most compatible with O, and AB
http://thesugarcubes.net/2007/04/11/blood-types-and-personality/

Blood Type and RH	% of Population
O Positive	38% *
O Negative	7% *
A Positive	34%
A Negative	6%
B Positive	9%
B Negative	2%
AB Positive	3% **
AB Negative	1% **

3% lehs! :)

Type 0	You want to be a leader, and when you see something you want, you keep striving until you achieve your goal. You are a trend-setter, loyal, passionate, and self-confident. Your weaknesses include vanity and jealously and a tendency to be too competitive.
Type A	You like harmony, peace and organization. You work well with others, and are sensitive, patient and affectionate. Among your weaknesses are stubbornness and an inability to relax.
Type B	You're a rugged individualist, who's straight forward and like to do things your own way. Creative and flexible, you adapt easily to any situation. But your insistence on being independent can sometimes go too far and become a weakness.
Type AB	Cool and controlled, you're generally well liked and always put people at ease. You're a natural entertainer who's tactful and fair. But you're standoffish, blunt, and have difficulty making decisions.

http://www.lifeshare.org/facts/bloodtypes.htm

Blood Type and Personality
There are four blood types: O, A, AB and B, with blood type A being the most common where so much research on blood types have been focused -- in Japan. In fact, 74% of the Japanese are blood type A. I find it interesting that the Japanese diet very much favors those with blood type A.
"B" type, the second most common blood type, does not do well on soy, or soba (buckwheat) common foods eaten in Japan. Fish is an important protein for B's and the Japanese consume more fish that any country in the world. Lamb, an important protein for B's, is not available there.
Here are some examples of blood type and personality, based on James and Peter D'Adamo's work:

• Blood Type A - Tend to be cooperative, sensitive, clever, passionate and smart. Often bottling up anxiety in order to get along with others, they may hold in their emotions until they explode. Many are tense, impatient and unable to sleep well. While they are capable of leadership positions, they may not take them because the stress is not good for their tightly wired systems. In Japan many "A"'s are in research. They have roles in discovering more about and refining science, economics, manufacturing, etc. Their research on microflora and other areas of medicine is some of the best and most meticulous in the world. They are perfectionists to say the least. This quality shows up in their perfecting electronics like TV's and also less expensive more efficient cars that were originally created here in the US.
  
  Blood type A's tend to have more sensitive constitutions. Too much stress weakens their immunity more quickly than other blood types. Low stomach acid is common among blood type A's even from birth, so special care should be taken when eating animal proteins. Using digestive enzymes, like Assist Dairy and Protein, along with consuming fermented foods and drinks is really a must for A's. It is not surprising to me that fermented foods like Miso and Natto play an important role in providing easily digested protein, in the Japanese Diet. They also eat raw fish which is much easier to digest than cooked.
• Blood Type B - Blood type B individuals tend to be balanced: thoughtful like A's and yet ambitious like O's. They are empathetic, easily understanding others' points of view, yet often hesitating to challenge or confront. Chameleon-like and flexible, they make good friends.

Peter D'Adamo found that While their immunity is strong, they are more prone to slow-growing viral infections like lupus, MS and chronic fatigue.
They may also have problems with hypoglycemia and blood sugar, especially if they eat the wrong foods.

• Blood Type AB - Tend to be very charming and popular. They don't sweat the small stuff and can be seen as spiritual and even at times a bit "flaky". Only about 2 - 5% of the population are blood type AB. There is never a dull moment in a AB's life, so if you find one for a friend, consider yourself lucky! Youll enjoy some exciting times together!
  
  Like blood type A's, AB's react to stress poorly. They are stronger and more active than type A's, but need to pay attention to stress levels so that they don't compromise their immunity.
  
  Sometimes it is difficult to be an AB. AB's don't like to fit in anyone else's "boxes". If they feel too confined, they'll break out of that box and do things their own way. When it comes to food choices and AB must discover when they are more B-like or A-like. For example, dairy foods like milk kefir can be excellent for them or not good at all.
  
• Blood Type O - Tend to be loners or leaders and are intuitive, focused, self-reliant and daring. They handle stress better than other blood types and have strong immune systems, a well developed physique and a physically active nature. Blood type O's tend to have sluggish blood flow and feel better with vigorous exercise for about an hour each day.

Obviously many other factors influence your personality. I think you will find like me that these blood type theories are quite fascinating. Do your own subjective research and see if you agree or disagree.

Yep, im AB+. Universal Acceptor.
Some of these are really quite true to me, I love being an AB, just like Heechul. :)