Jason Dean was an unhealthy ENTP personality type. His ego was fragile, particularly when he felt threatened or there was a chance that someone made him look incompetent. He was critical of others and argumentative. Jason Dean tried to rationalize his actions as a defense mechanism,JDhas schizophrenia,He has a pet hamster, as shown in the scene where J.D is building a bomb in his bedroom,Jason Dean, more commonly referred to as J.D., was a senior at Westerburg High School.