I have often heard people say, “since Jesus was God, he could be whatever personality type was needed in a specific situation.” However, I question this statement.
First of all, it seems to me that the doctrine of the Incarnation requires particularity. To become a human being requires taking on particular characteristics, because particularity is part of what it means to be a human being. Jesus had, like we have, a particular hair color. A particular eye color. A particular height and weight. Particular talents, particular predilictions, particular favorite foods, particular sleeping habits, particular likes and dislikes, humanly speaking. And if so, why should we consider it incredible that he had a particular human personality?
In addition, if Jesus could be any personality type he wanted, he would have would been exempt from many of the struggles that you and I face, as particular and limited and constrained people. Would the writer of Hebrews really be correct, then, to say that Christ “had to be made like his brothers in every way” (Hebrews 2:17)? Would the WCF be right to assert that Christ did “take upon Him man’s nature, with all the essential properties, and common infirmities thereof?” Our creeds and confessions say that Christ is fully human. But isn’t there something super-human about being able to turn into different personalities to fit different situations?
I don’t think we we can know with certainty which personality Jesus had, whether measuring by the Meyer’s Brigg personality test (as in the above picture) or another personality test. But we can know that he lived in that particularity without any sin, so he knows fully how to help us in our particular struggles and particular sins.