࣪⠀⠀𓏵 　shun kaidou 𓈒 ✙

Shun met Mineo when he was just a freshman and only just starting to become a chuunibyou. Mineo is partially responsible for the creation of Shun's alter-ego, The Jet-Black Wings. The following year, he felt great shame when Shun gave a speech at Mineo's graduation, reminiscing of their good times together as chuunibyou, fighting for the world.

Shun's mother is incredibly strict when it comes to school and studying, and is responsible for Shun's good grades. She snaps at him if she thinks he is slacking off and originally did not approve of Riki and Kusuo as his friends as she thought they got bad marks at school. She is unaware of Shun's chuunibyou and he tries hard to hide it from her.

Like most other boys at PK Academy, Shun is left without words whenever Kokomi is around. The effect of her beauty is so strong that when she mentioned Shun's bandages to him, he quickly removed them from his hands, suddenly becoming cured of chuunibyou. In a later chapter, it was hinted that Shun is aware of Kokomi's feelings for Kusuo when he mentioned Kusuo's name just to persuade Kokomi to come with them on a cruise.

Chiyo fell in love with Kaidou after he saved her from some punks in the beach and since then tried to get his attention. When they were stranded on an island, she clung to him for support. In one chapter, she got the chance to confess her feelings to him, which left him blushing and shocked. However because of Kusuo resetting time, this was forgotten and put their relationship back to the beginning. Kusuo even admitted that he felt bad because she finally worked up the strength to confess.

Shun was the second person to know about Aren's secret of being a former delinquent. Shun observed Aren fighting with a group of delinquents, quickly concluding that Aren must be one too and deciding to stay away. Shun remained scared of Aren until he and Saiki were saved by him from a group of delinquents who tried to steal their money. A strong friendship between the two soon developed, with Aren and Shun being on a first-name basis with each other, with Kaidou considering them to be "sworn friends". They are often hanging out and doing things together like getting motorcycle license.

Shun and Riki began fighting the moment they met in an argument over who Kusuo will go with (Kusuo however had never agreed to go with either of them). At first, the two did not get along, but soon became close friends as they hung around Kusuo together. Riki refers to Shun as 'little guy' or 'chibi', much to Shun's annoyance. While Kaidou and Riki are close, he is annoyed by Riki's idoicy and doesn't hesitate to call him out on it.

Shun went to great lengths just to befriend Kusuo. He saw Kusuo as a fellow outcast who would be compatible as a friend, and so tried to convince him to join in with his chuunibyou antics, with little success. Shun continued to follow Kusuo around anyway, much to the latter's annoyance.

The two have a good relationship and Shun enjoys Kusuo's company, trusting him as a reliable and kind friend. Kusuo often uses his powers to intervene when people take advantage of Shun's naïveté, going as far as being a temporary "member" of the Dark Reunion, the fictional organization that Shun made up.

Shun grew up as a nerd but decided to reinvent himself in high school. In his freshman year at PK Academy, he acquainted himself with Mineo Nobuaki, who taught Shun about chuunibyou. He eventually began to befriend Kusuo as because thought that Kusuo was special too. Kusuo originally did not want to associate with Shun but was left with no other choice after discovering that Shun saw him teleporting near his neighbourhood. It was later revealed that Shun was intent on getting close with Kusuo because he really wanted a friend and saw a fellow outcast as his ally. Shun hadn’t really seen Kusuo’s face when he teleported, but their friendship was already formed.

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.

Shun was shy in middle school and had no friends there at all. Once he began attending PK Academy, he started changing his personality to seem more adult-like. However, he developed a chuunibyou personality. 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, as shown when he accuses Riki of being a lolicon after observing him watching a young girl.

When Shun was in middle school, he had the persona of a nerd. He wore his hair down, with his bangs covering his face, and wore glasses. He decided to change his look when he entered high school in the hopes of gaining friends. Currently, 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.

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 (similar to a boxer).

Shun Kaidou (Japanese: 海かい藤どう　瞬しゅん, Hepburn: Kaidō Shun) is classified by his classmates as a chuunibyou. He calls himself The Jet-Black Wings (Japanese: 漆黒の翼, Hepburn: Shikkoku no Tsubasa) 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. Shun is one of the main characters of the series. He was played by Yoshizawa Ryo in the live action movie.