Reincarnated As A Mosquito - Chapter 20: Beast core obtained-

A master of Chakra Cultivation sacrifices everything - only to be reborn with a second chance.After giving his life to save his world, Alaric awakens in the body of a child. In this new realm where power is measured in tiers, bloodlines, and the strength of one's oaths, Chakra Cultivation is an unknown path.As Alaric purifies his chakras, each one unlocking profound abilities across body, mind, and soul, he gains an edge no native warrior can match. But his true test awaits in the Tower of Trials—a rite of passage for the world's young elites, offering immense rewards to those who can climb its treacherous heights. No one has ever reached its highest levels.If mastering his reborn powers wasn't hard enough, his journey will forge a bond with an entity of unimaginable strength - and lead him to lands where no mortal has dared to tread.

Xia Yan passed through to the world of Bleach and became an eleven-year-old boy. He was rescued by Renji and Rukia in the Seireitei, and he was studying at Shin’ō Academy, and he was a student of the same class.
He is a top student of the Shin’ō Academy, and he is vying for strength by various teams. In the end, he has entered the first team of secret mobile maneuvers.
He will use punishment to kill every person who tries to threaten the martyrdom and protect his loved one.

- Description from Novelupdates

“Noob. Weakest. Hardstuck .Tryhard. Trash. Pick a word, it fits me.”In a post-apocalyptic world overrun by monstrous creatures known as Eaters, some humans give up their humanity to gain a powerful weapon fused into their right hand. These people become Eater Blades, warriors who must hunt and feed their weapons with Eaters to rise through the ranks and prove their worth.In a world where rank means everything, Johnquis remains unranked.Why? Because his weapon is a chain. Everyone laughs, calling him “Leash Boy.” They mock him, never realizing the truth. That his chains aren’t made to cut… they’re made to control.This is a world where zombie-like monsters evolve, and a strange game-like system controls everything.Grind, rank up and evolve.Watch how Johnquis changes the game and tames the apocalypse.

Our straight (?) bottom woke up ten years into the future and found himself on the bed of his childhood friend… At the start, the bottom was shocked to his very bones, but he soon quickly accepted this premise and found the whole situation to be rather amusing. Precisely then, the bottom once again went back to his timeline — back to when he and the top were just platonic childhood friends.

Landmines include but are not limited to: Sweet & naive bottom, a president story, logic is dead, slow-progressing romance, the protagonist’s name has too many character strokes, the names are hard to pronounce, too many gay characters…

- Description from novelupdates