Kousuke Endou is a very unique classmate from Arifureta: From Commonplace to World's Strongest, known for being almost invisible to everyone around him—even automatic doors miss him most of the time! He originally had little presence in the main story, but later becomes a fan-favorite with many important moments, especially after he gains powerful abilities and builds an unexpected romantic harem. He uses his shadowy talents as an assassin and eventually plays a big role in major battles, impressing both allies and enemies.
Kousuke Endou is drawn to look like an average background character, with no special features. His hair always covers his eyes, and he rarely stands out in a crowd. Both in the novels, manga, and anime, he looks like someone you would not remember if you passed him on the street.
Kousuke is quiet, shy, and very hard to notice. Even his own family, friends, and teachers rarely remember he is around. Sometimes, he even gets marked absent at school when he is actually there. When he gets really depressed, though, he strangely starts to stand out more. He also has a strong sense of loyalty, especially to Meld Loggins, and cares deeply about his friends. When using his special skill "Abyssgate," Kousuke acts overly dramatic and talks like a fantasy villain, which embarrasses him very much afterward. He is brave in difficult situations and will go to great lengths to help others.
Kousuke is part of Juugo Nagayama's party after he and his classmates are transported to the fantasy world of Tortus. His job is Assassin, which matches his natural ability to hide. At first, people barely notice him. He suffers a traumatic rejection when a girl he liked does not even remember being in the same school as him.
In the Orcus Labyrinth, when attacked by demons, he uses his stealth to help others escape, and later reconnects with Hajime Nagumo. After Meld Loggins dies, whom Kousuke admired, he falls into deep depression and isolates himself. He recovers with the support of friends, and his story continues in side stories where he becomes a main character.
- Class: Assassin
This fits his naturally low presence and ability to move unnoticed.
- Stealth:
Can hide himself even from magical monsters, automatic doors (they only open for him 1 in 3 times), and most people.
- Abyssgate Skill:
In the final battle, he receives the title "Kousuke E. Abyssgate" and the "Lord of Abyssgate" skill, allowing him to create up to a thousand copies of himself and massively boost his fighting power. However, he acts very much like a chuunibyou (a dramatic kid who pretends to be a dark hero) while using it.
- Combat Skills:
By the main story's end, he is ranked as the best fighter in his class after Hajime's wives.
- Gravity Magic:
He conquers the Reisen Labyrinth alone in a week—an impossible feat—and wins powerful magic, shocking everyone.
Lana Haulia
Lana is a combat bunny warrior who gives Kousuke his cheesy hero name and becomes his main girlfriend. She is strong, caring, and serves as the "chief wife" in his group.
Emily Grant
A genius British scientist, who becomes one of Kousuke's girlfriends after he saves her from a crisis. She tries hard to cure his "chuunibyou" syndrome when he uses "Abyssgate."
Vanessa Paradi
A skilled British agent and Emily's protector. She admires Kousuke, becomes his third wife, and is a huge fan of all things dramatic.
Claudia Balenberg
Known as the most powerful exorcist in the Vatican, she is sweet but very clumsy. Kousuke saves her during a huge supernatural incident, and she falls in love with him.
Hinata Fujiwara
A nine-year-old girl from a long line of Japanese onmyoji (spiritualist) families. She admires and adores Kousuke, but he asks her to wait until she's grown up.
Hizuki Yayano
A tall, beautiful demon woman, actually the legendary "Shuten-Douji." She wants to become Kousuke's wife after he defeats her. She is proud and strong but truly loves Kousuke.
Kousuke gathers up to six girlfriends (one is self-proclaimed and one is still too young) and even more might join, mostly because of Lana's encouragement.
"Abyssgate!"
The Very Unseen Boy
Kousuke Endou can barely make anyone, or even automatic doors, notice him. Even though he's always at school, sometimes teachers think he's not there. His shy nature and lack of presence make him the perfect Assassin in the new world.
Becoming Useful
In the Orcus Labyrinth, Kousuke uses his unique stealth to help his friends escape from danger. When he meets Hajime Nagumo again in Hohrad, he asks for help for his classmates. Kousuke often feels he does not stand out enough, but his skill becomes important during emergencies.
Depression and Recovery
Kousuke is badly hurt by the death of Meld Loggins, his hero and mentor. For a while, he locks himself in his room and cannot face others. Later, with help, he comes back stronger and starts playing a bigger role in the team.
Gaining Power and Love
After helping in major battles, Kousuke finally gets attention for his work. Lana Haulia notices his unique skills and falls for him (while also being the cause of his dramatic hero name and powers). He is challenged to clear the Reisen Labyrinth and hurt Hajime if he wants to date Lana. Amazingly, he does both, achieving things most said were impossible.
Hero (and Embarrassing) Skills
Kousuke’s "Abyssgate" power lets him make up to a thousand copies of himself. When using it, he talks and acts like a "dark hero," sounding really dramatic, which makes everyone around him embarrassed, including himself. But this also makes him unbelievably strong.
Building a Harem
Because of his brave actions and Lana's honest heart, Kousuke gets several girlfriends, turning into a full-blown harem leader by the end of the story. Each girl likes him for his kindness and amazing feats (plus the awkward, funny times in his "Abyssgate" mode).
Life After the War
After the big fight, Kousuke returns to Earth but sets a goal of studying medicine so he can help the Haulia tribe as a doctor later on. He continues to travel and learn while doing requests for Hajime—always aiming to be helpful and support his new family.
Extras and Spin-offs
Kousuke becomes the star of several long stories after the main plot, thanks to his popularity. He is known as the right hand of the Demon Lord (Hajime) and the future leader of the Haulia tribe. New girlfriends and funny moments keep showing up.
- Kousuke is often called by his title "Lord of Abyssgate," or just "Abyssgate" or "Aby," more often than his real name.
- In a VR video game made by Hajime, Kousuke is used as an enemy character and is called "annoying" by Myuu, being the only classmate she doesn't use a polite form for.
- He is the only classmate (besides the main wives) to get lots of scenes and even lead a few stories.
- Kousuke wanted to have only one wife at first, but Lana and Emily encouraged more girls to join, leading to many funny moments.
- In Earth sections, Kousuke tries to become a doctor to help others, showing his caring side.
If Kousuke is extremely sad, his presence becomes so intense that people cannot ignore him. Most of the time, though, he is so easy to miss that even people he's standing next to don't notice him unless he speaks directly. His chuunibyou moments, caused by his "Abyssgate" skill, are both a great source of power and comic relief in the story.
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