Shirazu, like most of his teammates, was shown to have great respect for his mentor, Haise Sasaki. However, this did not stop him from going out of his way to execute missions without Sasaki’s permission, and so he was constantly seen accompanying Kuki Urie, the former squad leader, on dangerous assignments. Although he was a competent fighter with a ruthless nature, Urie described Shirazu as a simple-minded person. This became evident when Urie easily manipulated him into thinking Sasaki was using the Quinx for his own gain. He easily became fired up and spoke loudly.