Kaidou Shun is classified by his classmates as a chuunibyou. He calls himself The Jet-Black Wings and thinks that the world and its events are overseen and controlled by an Evil Organization called The Dark Reunion. Because of this, he is an outcast within his class. Shun likes to show off, but he often becomes cowardly in dangerous situations. When push comes to shove, however, he will endanger himself for those he cares about. His hair is spiky and he wears contact lenses. In reference to his chuunibyou, he wears red bandages on both arms to seal away his ‘powers’. He is the shortest boy in his class, standing shorter than most of the girls as well. (5'3") At school, he wears the standard male uniform of PK Academy, styled to fit his aesthetic. His shirt has a tattered collar and is torn in other places as well. During his days off, he dresses casually. Whether or not he is in uniform, his arms are always covered by sleeves or red bandages. He acts confident and conceited at school, claiming to be incredibly powerful and talking about how an evil organisation called The Dark Reunion is after him and controlling the Earth, in hopes that other students will think he's cool. He's often trying to impress Saiki and his other friends. His need for attention puts him in danger on occasion, however; for example, he tries to take credit for leading the rally against Saiko, unaware that Saiko is listening in; and he tells his younger brother Toki stories of his power and total control of their neighbourhood, which Toki then announces to a nearby thug smashing a vending machine, causing Shun panic. However, when feeling hopeless or when around his overbearing mother, Shun acts like a normal teenager. Despite all of his attempts to impress everyone, Shun has few friends aside from his group of associates, and is somewhat a loner at school. He is physically very weak, is terrible at sports and physical activity in general, and cannot swim; yet he continues to brag about his superhuman abilities which everyone except Toki knows he does not have. Shun has a delusional mind and a wild imagination, coming up with so many stories of the Jet-Black Wings that he started to believe in them. He often tries to seem cool and strong in front of people, especially Kusuo, but ends up embarrassing himself more often than not, never learning from these mistakes. He is quick to judge others. Aside from his delusions, Shun is skilled in his academics because his strict mother makes him study a lot to succeed. He has high grades in his class, showing that he is not too distracted from his studies. However, education does not equal all-around intelligence, as he is not good at sketch drawing or map navigation, and mistakes hair clinics for hospitals. He is also shown to be recklessly courageous at times, putting himself in danger in order to protect his friends and others. For example, without thinking, he jumped in the way of a lunging snake that was trying to attack a classmate. He did not consider what would happen to him until he already stood in front of the snake, at which point Kusuo had to step in.