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 3rd Division's lieutenant armband on his left arm. When he was a student at theShinigami Academy, his hair was shorter and shaggier, and he wore the standard blue uniform for the males.
Izuru is a gloomy and introspective person, not easily given to socializing with others. He generally appears weak and indifferent, leading many to believe he lacks ability as a leader. As an officer, he does not tend to inspire confidence or boost morale the way other lieutenants do. It should be noted that Izuru's current personality greatly differs from his days in the academy where he was shown to be much happier and slightly mischievous after noting that Shūhei Hisagi had failed his entrance exam twice, whereas Izuru passed at the top of his class, giving him the idea that, in a sense, his talent was greater.
His personality flaws are also assets: his introspection coupled with his tendency to worry makes him indecisive, but it also makes him sensitive to unusual behavior. His loyalty to his comrades inspires him to great efforts in their defense, as seen when Momo Hinamori attacks Gin Ichimaru and again in the anime when Makoto Kibune's attacks endanger other members of the 3rd Division.
Izuru is loyal to both his friends and his duties, perhaps to a fault. Despite the close friendship he shares with Momo Hinamori, Izuru shows that his loyalty 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.
Wabisuke (aka "the Wretched One," translated in the English manga as "the penitent one"): Wabisuke is very simple and plain in design. Its normal form is indistinguishable from a plain katana. The cross guard is a normal rectangular one, with only an omega design on the top and bottom half.
- Shikai: Its Shikai command is "Raise Your Head". When activated, the blade loses its curve and straightens, and where a normal katana would end, Wabisuke's blade makes two 90 degree angles, forming three sides of a square reminiscent of a hook. Even more interestingly, the cutting edge of the blade is on the inside of the angles, not the outside.