Examples of some work on personality traits, here using the Five Five traits. It seems that those with AB were more introverted. This would be consistent with a lower temperament in those without ABO O. It is far from settled in the research, but there is a trend for those with ABO A or B or AB to be quieter , sometimes more neurotic than ABO O types.
Another study showed that those with musical talent had higher agreeableness while those with other talents had higher extraversion. All the talented individuals had higher intellect. This was a study from eastern Europe.