Isekai

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…..

Blood Parasite Synopsis: “Would you like to be part of my family?” Archive, the devil race’s weakest, was saved by the Demon Queen right before death overtook him. Unable to have children and capable of harming anything that approaches him, Archive is the only member of the Demon Queen’s “family” that continues living. However, demons and humans hate each other, and they are fighting wars at the cost of each other’s peace. Eight heroes lure the Demon Queen with promises of peace to defeat her.

Gray, a B-rank adventurer, was supposed to be just a mob character in the RPG "Bright Fantasy". However, by chance, he saved an orphan who was attacked by thugs on the roadside and decided to raise him as his father. But the orphan turned out to be the hero of this world, "Iska". This choice would greatly change the fate of the world.B-Grade Adventurer With a Bad Guy Face - Becomes a Daddy to the Hero and His Fellow Children ; 悪人面したB級冒険者 主人公とその幼馴染たちのパパになる ; A B-Rank Adventurer With an Evil Face Becomes a Father for the Hero and His Childhood Friends

Lonely Attack on a Different World summary:
The strongest doesn’t need any cheats!

Haruka, who spends his high school life a loner, was suddenly summoned to another world one day along with all his classmates.

When ol’ God enters the picture, Haruka believes he can just choose whatever cheat skill he wants to help him survive in the new world...
But, contrary to his expectations, that list of cheat skills works on a first come, first serve basis. And so, his classmates pick out all the cheat skills.

Kitase Kazuhiro is an ordinary salaryman who always leaves the office on time. Though this is Japan, so perhaps he's not really ordinary after all. What's truly strange comes after that; Every night, he takes a shower, changes into his pyjamas and has a good night's sleep. Then he dreams of a fantasy world, and only wakes up when he dies or sleeps in that world. One day, he's killed after stumbling onto a dragon's lair. "A nightmare", he sulks, until he finds his elf friend in his bed.

Alexander Purchinov is president for life of the country of Pursia, a country ruled by violence and the influence of its government. Alexander always desires to be dominant, and "ride" things, whether literally or figuratively. Now that he has already ridden his country, his next target is a fantasy world that has orcs, wyverns, and centaurs.

A man who lived for the sword, died for the sword after battle with the strongest known being, the Dragon God. At the verge of his death, in his heart there came an admiration for magic and Dragon God as reward answered and granted him this wish, but in the form of a transmigration to another world... but, in that world, Souma, was branded as incompetent person instead.