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  Personality is not fixed, it changes constantly with time, place, and situation. You cannot easily determine its nature with a single sentence or a phenomenon. Even so, through the relationship of blood type, we can still roughly predict the change of a person's personality, and achieve "an unpredictable prophet".

  As time changes, how will the personalities of people with blood type O change?

  O type personality changes the most with time. Among young people who have just started to work, O-type people are generally honest, loyal and docile to their superiors, and are easy to gain leadership favors. After entering adulthood and having some experience at work, they began to actively express their opinions and express themselves, sometimes appearing tough.