Izuru has blue eyes; and, shoulder-length, blond hair that is combed into three points, with two in the back of his head, and a third combed to cover his left eye. He also wears the standard Shinigami robes, and the third division's lieutenant armband on his left arm.
Izuru is a gloomy and introspective person, not easily able to socialize with others. He generally appears weak and indifferent, leading many to believe he lacks the ability to be a leader. As an officer, he does not tend to inspire confidence or boost morale the way other lieutenants do. However, Izuru is loyal to both his friends and his duties. Despite the close friendship he shares with Momo Hinamori, Izuru shows that his loyalty to his former captain knows no boundaries when he defends his captain while she is in a grief-induced rage from her own captain's apparent death. Despite this, he calls himself a "monster" afterwards for raising his sword against her. Izuru considers the essence of war to be despair, as exemplified by the symbol of his Division, the marigold. He also hates to fight unless prompted to or given orders.