The concept of blood types determining personal traits has a dark history.
It was allegedly used by Nazis and Japanese Imperialists to promote ideas of supremacy over different races and countries in the 1920s and 1930s.
They can also be considerate to others, patient and are often punctual.
They can be highly creative and can be perfectionists, which can cause them to become too focused on the details.
The linking of blood types and personalities is prominent with the basic blood types: A, B, AB and O.