Does each person of the Holy Trinity have a different personality or is it one personality?
Saint Gregory Nazianzen says, "It is necessary both to maintain the one God and confess the three Persons, each in his own individuality". According to Saint Gregory, the God is three persons without division and the three persons are united but with distinctions. Because of this both the division and the union are paradoxical. So you can say They are One with Three distinct (not different) personalities.