Kaidou Shun

"Come with me, Saiki... I'm feeling something ominous wind coming from the town."

- Shun to Kusuo

Shun Kaidou (海藤 瞬, かいどう しゅん lit. Kaidō Shun) is classified by his classmates as a chuunibyou. Self-proclaimed The Jet-Black Wings (漆黒の翼 lit. Shikkoku no Tsubasa), Shun thinks that the world and its events are overseen and controlled by an Evil Organization called The Dark Reunion. He is an outcast within his class who 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.

Appearance
When Shun was in middle school, he had the persona of a nerd. He wore his hair down, covering his face with his bangs and wearing glasses. However, with the intent of gaining friends, he started planning to change himself when he entered high school. 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. His shirt has a tattered collar and is torn in other places as well. During his days off, he is shown to dress casually, with his arms always covered by sleeves or bandages.

Personality
Shun used to be shy in middle school and he had no friends at all. Once he began attending PK Academy, he started changing his personality with the plan of becoming adult-like. However, he developed a chuunibyou like personality. He acts confident and conceited at school, lying about being incredibly powerful and talking about how an evil organization called The Dark Reunion is after him and controlling the Earth, in hopes that other students will think he's cool. He often attempts to impress Saiki and the others. However, when feeling hopeless or around his overbearing mother, he acts like a normal teenager. Despite all of his attempts to impress everyone, he still does not have many friends, aside from his group of associates and is somewhat of a loner at school. He pretends to be courageous, but when faced with danger he fearfully retreats. He is physically very weak and is terrible at sports and physical activity in general. He also cannot swim.

Shun has a delusional mind and a wild imagination. He often tries to be cool and strong in front of Kusuo, but ends up humiliating himself more often than not. He is quick to judge others, as shown when he accuses Riki of being a lolicon after observing him watching a young girl.

In spite of his delusions, Shun is skilled in his academics because of his strict mother making him study to succeed. It was even said that he has high grades in his class, showing that he is not too distracted from his studies.

Past
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 he delusionally thought that Kusuo was special too. Kusuo originally did not want to associate with Shun, however he 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.

Quotes

 * (About Kusuo) "I only wanted…to be friends with Saiki-kun."
 * (To himself) "I won't allow that to happen. I will protect the world! For I am The Jet-Black Wings!"
 * (To Riki) "I misjudged you, Nendou! Don't you dare lay your hands to those frail little girls!"
 * (To Aren) "I don't care about your past. What matters is who you are now and who you'll be in the future!"

Trivia

 * His name is derived from the Japanese term for Teleportation (瞬間移動,しゅんかんいどう lit. shunkan idō).
 * Aside from his family, Aren is the only one to call him by his first name.
 * His guardian spirit is a chihuahua.
 * His aura is one similar to that of a chipmunk's.
 * His favorite food is salami.
 * His character song is titled "Bloody Moon" which he sang in Episode 18.
 * Sometimes, when he is about to do an act, a part of the song "Judgment Knights of Thunder ~Legendary Hero" plays.
 * In Season 2 and Reawakened, a part of another version of Judgment Knights of Thunder is heard playing. This version is called "Continued Judgment Knights of Thunder ~End of Oblivion".
 * His appearance of having light-blue wavy hair and red eyes greatly resembles Sakata Gintoki from Gintama, another series from Weekly Shonen Jump by Hideaki Sorachi.
 * In both Japanese and English (Funimation dub) versions of the anime, he shares the same voice actors as Yuno from Black Clover, another series from Weekly Shonen Jump by Yuki Tabata.
 * In the two times, Shun was scammed by others about Dark Reunion, Kusuo came to his aid and this led to the scammers believing in his paranoia.