Some more:
Blood Type A: cooperative, sensitive, clever, passionate and smart, bottle up anxeity, tense, impatient, unable to sleep well. Capable of leadership positions, but 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. Tend to have more sensitive constitutions.
Blood Type B: balanced, thoughtful like A's , yet ambitious like O's, 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. They may also have problems with hypoglycemia and blood sugar, especially if they eat the wrong foods.
Blood Type AB: tend to be charming and popular, 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! You''ll 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.
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.
Source:
http://www.bodyecology.com/07/03/01/link_blood_type_personality_diet.php