This incarnation was most definitely not Human, and stood apart from others, even most of his own people.

When Sarah upbraided him over his callousness at the sight of Laurence Scarman killed by the animate corpse of his own brother, the Fourth Doctor reminded her of the larger issue of stopping Sutekh. His mind was often leaps ahead of anyone, including himself. He delighted in keeping both friends and foes alike off guard with oddball humour and curious pranks, as in his second incarnation. Although generally peace-loving and kind-hearted, as per most of his other incarnations, the Doctor could also react with sudden violence when necessary; he was also not against taking a life in extreme circumstances.