Hiashi Hyūga Personality Type, MBTI

Hiashi Hyūga personality type is ISTJ, which means that he is a quiet, serious, and dependable person. He never shows his emotions towards anyone, unless he is alone with them, and under normal conditions he seems very calm, composed, and collected. However, once he does get angry or decides to show emotions, he is very violent, hostile, and unforgiving. He is the only member of his clan to have never used an emotion-based jutsu, including the family jutsu such as the clan's kekkei genkai (he is also one of the few Uchiha that never played with their kekkei genkai, simply because he is unable to use any KG techniques without killing his opponents; in fact, when his father tried to teach him the family kekkei genkai, he ended up killing his father). He is in fact in no way an emotionless person: in certain situations, such as in the anime when he was in the Academy and in the manga when he is in his final days in Konoha, we can see that he does indeed possess emotions such as sadness and sorrow.