Born as the Thirteenth Prince, Noah was originally in a position removed from the imperial succession, so he freely passed his time in the fief granted to him.

However, the Crown Prince died before the Emperor. The imperial succession would be fairly contested among the remaining princes.

Noah, being the strongest despite living freely, overwhelmed the other princes and eventually became the Emperor with the most power in the world.

Leon, a former Japanese worker, was reincarnated into an “otome game” world, and despaired at how it was a world where females hold dominance over males. It was as if men were just livestock that served as stepping stones for females in this world. The only exceptions were the game’s romantic targets, a group of handsome men led by the crown prince.

In these bizarre circumstances, Leon held one weapon: his knowledge from his previous world, where his brazen sister had forced him to complete this game. Leon, who really just wants to to live as a shut-in in the countryside, uses that knowledge to raise a ferocious revolt against the women and handsome men.

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.

"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.

Used to be a Hero, and before that a Sage, Lex has reincarnated. Again. This time he just wants to be a NORMAL adventurer…

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.

Amamiya Hiroto is unlucky. His life consisted of misfortune after misfortune, culminating in an unlucky death during an incident on a school boat trip, trying to save a girl he barely knew. After death, he met a god of reincarnation who requested that the hundred or so dead passengers - one of them being the girl he tried in vain to save - be reincarnated into another world.

Yet a series of unfortunate events forced Hiroto to reincarnate with even less luck than before, starting with nothing but a tremendous amount of Mana. His second life, far worse than his first, came to a cruel end.

However, upon meeting the god a second time, he was informed that there would be yet another reincarnation - one that had already been set in motion and could not be stopped. Not wanting Hiroto to endure a third life filled with suffering, the god cursed him before he was reborn in the hopes that he would either die quickly or commit suicide.

Hiroto was reborn once more as a half-vampire, half-dark elf. A dhampir. Not wanting a fourth life, he is determined to live this third life with the only things remaining from his previous lives - Death Magic and his enormous Mana pool.

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...

When Theodore was dropped into a waterway by his half-brother, he suddenly recalled the memory of his past life. He had been a Japanese citizen known as Kirishima Kagehisa, placed inside VRMMO character he had made in Break Force Online. "Theodore" is a Combat Mage that Kagehisa played within BFO, and he realized his skills were progressing well even in this other world. Theodore, who had lightly brushed off his half-brother to make his own place in the world, had ventured off to the large labyrinth existing at the Boundary City, Termuilles.

Very ordinary company OL (Office Lady), Azusa Aizawa, died from overwork.

For that reason, I decided to live a slow life in a house in the mountains as an immortal witch with the figure of a 17 year old.

The main source of income is to defeat slimes inhabiting the area to acquire magic stones. I sold these at the Guild in the village. Besides that, I made medicinal herbs, became known as “The Witch of the Highlands”, and lived with respect and trust.

However, as a result of continuing to beat slimes for 300 years, the experience values accumulated too much, and I unknowingly became level 99, the world’s strongest witch .

The level 99 witch now works together in the village with her dragon-girl apprentice in moderation, while helping everyone in the village.

The virtuous will definitely be rewarded!

This world judges the deeds and good karma of your previous life, and grants you a rank when you are reborn. The benevolent man, even surprising the gods through this, decides to be reborn as the son Alexander of a noble family, and thus starts his SSS-Rank life! Follow Alec's journey as he lives his life as a SSS Rank!!

The son of the world's top assassin organization leader, Doyul, has transferred to a Korean high school!

Coming in with nothing, Doyul takes on a request from Dong-gu, a victim of school bullying, and begins taking down the local delinquents one by one?!

The story of a man who rises to become the strongest in the War Against Bullies universe!

Haruyoshi, the strongest onmyoji was on the verge of death after the betrayal of his companions. Hoping to be happy in the next life, he tried the secret technique of reincarnation and was sent to a different world! Born into a family of magicians, the magic he failed to inherit was nothing compared to his previous skills as an onmyoji. “Who needs magic? I’ll survive in this world with my old techniques!”

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...

Satoshi Osako was a player of the VRRPG 『Sword and Sorcery』 who defeated the Evil God and died for his troubles. When he awoke again he found himself in a strange unknown forest. Furthermore he possessed his avatar’s body and abilities. In other words, he was a cheat. Can a 40 year old DT, live peacefully in this world?

Let his isekai adventure begin.

It was in the year 2800 of the Midgard calendar. Back then, there was a Overlord who once reigned supreme and had reached the very brink of subduing the world. Her name was Lufasu Mafaalu, a great woman dreaded as the Black-Winged Overlord. She was too strong, too fast, and too beautiful. However, she was defeated by Heroes who opposed her ferocity, and her ambition was brought to an end.

Or so went the story of our protagonist’s in-game character, whose body he now possesses for some reason in a world 200 years after Lufasu’s downfall. Follow our protagonist as he becomes unnecessarily feared by his surroundings and unnecessarily worshiped by his former subordinates as he―or now she―cheerfully travels around this fantasy world.

Just like how everyone adored heroes in their childhood, a certain young man adored those powers hidden in shadows. After hiding his strength and living the mediocre life of a mob character by day while undergoing frenzied training by night, he finally reincarnates into a different world and gains ultimate power. The young man who is only playing at being a power in the shadows, his misunderstanding subordinates, and a giant organization in the shadows that gets trampled….. This is the story of a young boy who had adored powers in shadows possibly eventually reigning over the world of shadows in another world.

The manga is a re-imagining of the famous Journey to the West story, and centers on the Buddhist priest Genjō and his journey to India as he is accompanied by three beautiful and charming women: Son Gokū, Cho Hakkai, and Sha Gojyo.

An old person who has piled up good deeds in Japan reaches the end of his life, and is reincarnated into another world as Lean Olgott, the grandson of a certain king. One day, the boy, who was raised showered with love his family, noticed that he had been bestowed the title The Child Loved by God. He disregarded it for a while, but gradually, the abnormality of his own abilities became evident.

Magic power that far surpasses that of ordinary people, conversing with plants……. the cause for all of these, as expected, was that title!

One night, Lean Olgott, who wished for a peaceful daily life, was called out by a legendary sacred beast, and life completely changed–!

Sano Yuji, a black company employee, is summoned to another world while finishing his work at home. His profession in the other world, a Monster Tamer, is considered a job that makes it difficult to become an adventurer. However, thanks to some slimes he met, which read several magical books, he gained magical powers and the second profession, Sage.
Yuji acquired overwhelming power, but is he conscience of his strength? Blindly becoming unparalleled and strongest in the world!