Bumi's eccentricity arose out of the fact that he always kept his mind "open to the possibilities". As a child, Bumi decided to use the Omashu delivery system as a chute ride, for which Aang dubbed him "a mad genius", a name that Bumi seemed to appreciate. Although Bumi appeared senile, he was in fact a brilliant and patient tactician, willing to wait until the opportune moment to strike in order to produce the most favorable outcome. Bumi carried himself with the same composure during a quiet, peaceful meal as he did when his city was under attack and he rarely explained his actions, which tended to infuriate his subordinates.