The worst student of Westrod Academy, the disgrace of the Blake House.
A new soul enters the lifeless body of Frey Blake, the boy who couldn’t handle his painful life and chose death instead.

“What’s with this body?
I’ll have to check every little detail of it.”

The Great Mage Lucas Traumen.

He earned his chance at revenge by gaining the flesh and bones of Frey Blake the disgrace!

And now begins the interesting adventure of the Great Mage who returned after 4000 years!

Every night, he prayed to wake in a world of magic and adventure. One day, his wish came true, though not in the way he expected. He awoke in a vast, snowy wilderness as a Barbarian, a powerful race feared for their strength and savagery.

Though the world was everything he’d dreamed of, his new form came with challenges. Determined not to live as a mindless brute, he learned the human tongue, studied their customs, and became a registered mercenary. But despite his efforts to belong, his monstrous appearance and overwhelming strength lead most to see him as a threat.

Now, caught between the world he longed for and the one that rejects him, he must fight to prove he’s more than what others fear and uncover the reason he was brought here in the first place.

There has been much conflict between the races of the 'Humas', the 'Gabranth', and the 'Evila'. To combat the 'Evila' race's Demon King, the kingdom summons five high school students from 21st century Japan who have the power of Heroes.

However, only four out of five of those students had the status title of 'Hero'.

Okamura Hiiro was summoned by accident since he sat near the other four students in class. Unlike them, he did not have the title of a 'Hero' but instead he had the title of 'Word Master' and 'Innocent Bystander'. Seeing through the 'Humas' kingdom's deceit and insanity, Hiiro decides that he has no wish to partake in their selfish war. Leaving the castle, Hiiro decides to join the Adventurer's Guild and does whatever he feels like. Who knows? Maybe there is some merit to being a 'Word Master' and an 'Innocent Bystander'.

"I'm terribly sorry!"

A god was suddenly prostrating in front of Kayano Takumi. He was apparently killed by mistake. Moreover, he can’t be reborn again. However, he is able to live in a different world? Then, let’s do that, please. The god made a mistake again and transferred me into a dangerous forest. Seriously, what’s going on? Besides, there are children here. I can’t leave them here, I will take care of them.

From LHtranslation :

In a certain world, there was someone who excelled in magic combat, people called him 『Sage』. Seeking the strongest combat art, he devoted himself to research every magic and combat arts in existence. And the conclusion he arrived at was very cruel, 『My body is not fit for magic combat』. Yet he didn’t give up. He sealed his own soul with a magic art, and was reborn in a far-off future. And the magic theory in the completely changed world he saw there was of unbelievably low level.

The Hero’s party was attacked by a large group of powerful devils. The party will no doubt be annihilated if this were to go on.
One member of the party, the strongest mage, Rakku decided to stop the enemies in their tracks.

A man who was once called the world strongest agent ended up becoming a teacher after his retirement to train the new generation of agents. After many years of training his disciples, he is killed at the age of 60 by the ploy of a secret organization and was reincarnated in another world with all his past memories.

Though he was surprised by the magic and the strange species of that world, he adapted very fast to his condition as a newborn and took advantage of it. He acquired special magic and gained a massive amount of strength thanks to his tight discipline, in order to reach his goal: Resume his career as a teacher which he left halfway through in his previous life.

This is the story of a man, who, based on the memories and the experiences of his previous life, became a teacher who travels through the world with his students.

Raul who had defeated the demon king as the strongest hero should have become the savior of the world.

Having his treasured companions and family killed by power hungry aristocrats, he was executed with false charges brought against him by the princess. Just before his life collapsed, at last his heart fell into darkness.

...I will tear those traitors from limb to limb. Burn them at the stake. Sever them to pieces. Skewer them. I will kill every one of those bastards without mercy and make them taste hell's suffering.....!!!

Obtaining the power of darkness, Raul was revived. Sneering, he vowed revenge.

“Oh, I’m looking forward to it – from now I'll bask in their blood as I please.”

Several days after the hero's revival in the imperial capital where flowers bloomed in profusion, the parade that would advance towards tragedy began.

Liam Sera Banfield is a reincarnator.

He was reincarnated into a fantasy universe of swords and magic, but at a time that civilization was already making advancements into outer space. The setting takes place in an intergalactic empire, a space opera-like universe where humanoid weapons and spaceships do battle. Liam, who had incarnated into an aristocratic family in a monarchic society, has the ambition to one day become an evil lord. In his previous life, Liam had unfortunately lost everything and died in despair.

"It’s foolish to live for others. I will live for myself."

Holding those feelings in his chest, he starts towards his second life, but is instead worshipped as a virtuous ruler from his difference in values. Will Liam be able to safely become an evil lord?

Tenjou Yuuya has been a bullied boy since the past.

He lives in the home of his beloved grandfather while he goes to school. As usual, he receives a harsh bullying, and he takes an extended absence from school to have some time to heal his wounds.

While on this long time of absence, he takes the opportunity to clean his grandfather's house and goes to a room he never went before, where his grandfather keep many different objects that he gathered from his travels around the world. While he was arranging the objects, he found a door not on a wall among the objects.

Out of curiosity he opens this door, what he found on the other side was...

I reincarnated into the "Villainess Eumiella" from an RPG Otome game. In the main story, Eumielle'as merely a side character, but after the ending, she reenters the story as the Hidden Boss, a character on par to the Heroes with her high stats!!

Lighting a fire in my gamer's soul, and taking advantage of being left on my own in my parent's territory, I train! Train! And at the end of my training...... By the time I enter the academy, I managed to reach level 99.

Though I had planned to live out my days as inconspicuously and peacefully as possible, soon after entering the school, I'm suspected by the Heroine and Love Interests of being the "Demon Lord"...?

A popular Web novel of seeking a peaceful life, a fantasy story of the strongest villainess!

A magic nerd's life came to an end after a dreadful encounter with the nobles who ended his life with a powerful spell. His last wish, being able to study and master more magic, has been answered when he was reincarnated as Saloom Lloyd, the 7th prince of Saloom Kingdom. Now he'll be able to perfect his magic as he pleases...

The weak prince of an insignificant country, Davey. After becoming comatose, his soul escaped to a temple where the souls of heroes gathered. He trained for a thousand years and has now returned as a max level hero!

“Just you guys wait, I’m gonna face you all head on!”

The refreshing story of Davey’s royal life and revenge has just begun.

Unemployed 19-year-old Kazuma has been summoned to Asagiri Island, rumored to be home to long lost pirate treasure. He ends up working as an odd-job man at Umine Inn, a traditional Japanese café with women-only lodgings and a host of eccentric yet beautiful women.

Astra Ludger Doomsday, former captain of the royal knights has finally achieved his dearest wish: To retire and use his savings to get his very own house.

But not long after finally arriving at his sanctuary, a young girl crash-lands into his house. The girl is an apprentice witch and seems to mistake Astra for someone else.

As the master of the School of Unholy Arts and as the undefeated Unmasked Demon, MookHyang unfortunately falls to a strange fantasy world by the magic of his enemies (School of Blood Arts). In the new world of elf, sorcerer, knight, and dragon, MookHyang’s adventure of finding a way back to his old world (Murim) unfolds.

"THE NEW GATE", an online game that trapped its players and turned into a death game, was now releasing the thousands of players that had been dragged into it, thanks to the efforts of Shin, one of the most powerful players. But after having defeated the last boss and freed everyone, he was swallowed up by a strange light and found himself inside the game world 500 years in the future and unable to leave.

After losing his girlfriend to a brave hero, Toru is expelled from his S-Rank party. With a feeling of sadness and pain in his heart, he defeats a demon he meets outside the city, and his ability [to save experience] is broken! Toru becomes level 300 in the blink of an eye! With this power that far surpasses that of heroes, there is nothing that can stop him. Kaede, a slave he met on his journey, forms a group called the "Mangyu Brigade", and easily completes dungeons, acquires the legendary sacred weapons, and thanks to his skills, his friends level up easily! He rescued a countess who was attacked by bandits on the road, and befriended a legendary beast. Oru's journey continues at a leisurely pace, as he repeatedly encounters various people along the way, while his former party of heroes are deprived of opportunities to play an active role and fall into decline. This is the beginning of the life of a 300 level warrior!

Original Webnovel: https://ncode.syosetu.com/n9483ge/

In this new action-comedy, everything about a young man named Saitama screams "AVERAGE," from his lifeless expression, to his bald head, to his unimpressive physique. However, this average-looking fellow doesn't have your average problem... He's actually a superhero that's looking for tough opponents! The problem is, every time he finds a promising candidate he beats the snot out of them in one punch. Can Saitama finally find an evil villain strong enough to challenge him? Follow Saitama through his hilarious romps as he searches for new bad guys to challenge!

Note: Nominated for the 7th annual Manga Taishou Award in 2014. Won the 2017 Sugoi Japan Award. The manga also was nominated for an Eisner Award in 2015 and a Harvey Award in 2016.

From MangaHelpers:
29-year-old programmer Suzuki Ichirou finds himself transported into a fantasy RPG. Within the game, he's a 15-year-old named Satou. At first he thinks he's dreaming, but his experiences seem very real. Due to his use of a 3-time-use special power (meteor shower), he ends up wiping out an army of lizardmen and becoming very high level. He hides his level and plans to live peacefully and meet new people, though developments in the game story (like the return of a demon king) might get in his way.