Itachi Uchiha was an INFJ personality type. He intuitively understood others and could naturally detect their motivations. Being so in touch with people's emotions INFJs can even know how someone else is feeling before that person knows it themselves. Itachi is cold, stern, and quiet. He does not talk much, nor does he show much emotion. Try to keep a straight face and your voice calm and level. If you do talk, keep your language smart and polished this is a nod to the intelligent side Of Itachi