Fantasy World School Manga with an Overpowered Main Character.

1. Jishou! Heibon Mazoku No Eiyuu Life: B-Kyuu Mazoku Nano Ni Cheat Dungeon Wo Tsukutteshimatta Kekka.

A small dungeon is fine. And yet I create a massive and powerful dungeon. Chrono is an ordinary demon attending a dungeon creation class at the demon lord’s academy. Upon hitting 20 year’s old, Demonic Beings are encouraged to attend the academy and live there while perfecting the art of creating dungeons. Chrono thinks that creating a small dungeon would be sufficient, however, what emerged was an extremely massive dungeon with hundreds of layers. Moreover, the level of the dungeon exceeded the dungeon created by the legendary demon king by a large margin. Chrono who was looking for an ordinary and comfortable life quickly became the focus of attention of many and quickly rise up within the demonic society. It won’t take long until he was hailed a hero.

2. Shin No Jitsuryoku Wa Girigiri Made Kakushite Iyou To Omou.

A world where you can contract with God and gain skills. Born as the third son of a famous knight family, Yuno was so busy controlling his innate power that he was eventually called "incompetent.".

However, in the magical knight academy, who was enrolled for some reason, he fulfilled his fateful encounter with an unnamed god who was despised as "incompetent" like himself..

Yuno, who contracted with the goddess and named her [Athena], secretly decided to make her the highest god, and decided to get a little more serious.

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3. Eiyuu Kyoushitsu.

Long ago, a powerful demon lord ruled over the people until an equally powerful hero rose up to defeat him. To counter future threats, Rosewood Academy, a school for heroes-in-training, was created. Today, Rosewood Academy enrolls only the best of the best, and Arnest Flaming is the best of them all. The top student in the school, a dutiful girl nicknamed “Empress of Flame”, she has an irritating encounter with a light-hearted boy in the school hallway one day who seems to equal her powers, though she’s never seen him before. He introduces himself only as Blade, and Arnest soon finds out not only is he transferring into the school as a new student, but she is personally requested by the King to help him settle in to daily life in Rosewood Academy.

4. Saikyou Mahoushi No Inton Keikaku: The Alternative.

In a world where the Fiends run rampant... Magicmaster Alus Reigin, the young prodigy that has defeated more Fiends and reclaimed more of humanity’s lost territory than anyone else alive, requests retirement from military service at age 16. But due to the twists and turns of fate surrounding his status as the No. 1 Magicmaster in the nation—the top Magicmaster out of more than 100,000—he ends up as a student at a special magical institute, hiding his identity and training his successors – a pair of beautiful Magicmaster girls! Not to mention continuing to defeat Fiends in secret..

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5. Kage No Eiyuu No Nichijou-Tan.

The "Great War of Heroes," in which the hero and the demon king vie for survival and power in each incarnation. The fourth great war was also a war where the heroes defeated the Demon King… it's an undisclosed fact. Twoeight, the ace of the “Agency” in the dark side of kingdom, undertakes all the dirty work for country and supports the Hero to subjugation the Demon Lord from shadows. As the unsung hero, Twoeight hopes to live a peaceful life after the war. However, defeating the Demon Lord is not enough to bring peace to the world.

6. The Hero Who Has No Class. I Don't Need Any Skills, It's Okay.

“Classes” are given at the age of 10, and the presence or absence of “skills” greatly affect life. Arel, the son of “Sword Princess” Fara and “Magic King” Leon, has been branded as “Classless”... But even without a job or skills, Arel believes he can persevere through effort.

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7. Monogatari No Naka No Hito.

From MangaHelpers: A young noblewoman once dreamed of becoming a magic user like in the old tales, but her time in magic school has dimmed her passion. One day, a mysterious man comes to her rescue in the forest, using magic like in the old stories. Despite the fact that he is clearly skilled in magic, he is thrilled by the idea of learning new techniques. Since the only way to do that in this day and age is in magic school, he alters his appearance to school-age and decides to accompany her back to school!

8. Mahou Shoujo Gakuen No Suketto Kyoushi.

Ruu Brandel, a genius wizard with a talent for thousands of years. One day helped a beautiful aristocratic daughter, Franc and was to be assigned to “Magic Girls' Gakuen” where he acts as a teacher! Now, the “non-standard” teacher life by the strongest wizard opens!

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9. The Iceblade Magician Rules Over The World.

The Arnold Magic Academy, a prestigious school that has produced a lot of great wizards. One boy, Ray White, decided to attend as the only wizard from an ordinary family. He is surrounded by students from aristocratic families and magicians who distance themselves from him. But people don't know. He is a person who has made a lot of achievements in the previous Far East fight, and now he is said to be the strongest of the seven great wizards in the world. Despite being ignored as a magician, he will eventually show his power to those around him?

10. Mashle.

This is a world of magic where magic is used for everything. But deep in the forest exists a young man who spends his time training and bulking up. He can't use magic, but he enjoys a peaceful life with his father. But one day, his life is put in danger! Will his muscular body protect him from the magic users who are out to get him? Powerfully trained muscles crush magic as this abnormal magical fantasy begins!