Marvel: The Ultimate Superman - Chapter 18. Natasha

In a land ruled by vile monsters, where death is common and life is cruel, one outcast endeavors to have it all. When misfortune drags the odd goblin Stryg from his forest home and into the ruthless city of Hollow Shade, he must try and adapt to a world that only sees him as a dimwit savage.Stryg finds himself embroiled in a school of magic, where an aristocrat's smile is filled with deceit and the simplest of remarks may lead to death threats. Yet nothing will stop him from aspiring to his beliefs of glory: power, honor, and food with salt.But as Stryg navigates through the muddled grey waters of the Ebon Realm, he will learn that some monsters lurk everywhere.

The story is about a a hitman, Who dies because of his own recklessness and transmigrates into a game he used to play after his retirement as a hitman.I'm not gonna spoil any further, but i might answer few of your questions.Is MC overpowered?Nope, he'll become strong over time and all battle he'll fight will be because of his effort and techniques.Is there magic and adventure?Yes! It have both magic like normal isekai with adventure and fighting with monsters and many other things. There are other important things like “Essence Stone” But let's talk about it in the chapters.There will be harem?Not really, He will be in contact with many beautiful female and males but one waifu but i haven't decided yet.All i can say is, give it a try, I'll try my best to make it worth your time.

Lin Li accidentally enters another world while playing with his smurf mage account just after he maxes out all kinds of crafting skills, bringing with him various top-grade materials. Although his character is practically powerless, what he gains in return is unprecedented magical talent! Can he survive by himself after being thrown into another world?

- Description from Novelupdates

A generation’s War God, once overlooking the world with disdain, had fallen into disgrace because of a conspiracy, becoming a mere son-in-law. However, what nobody had expected was that it was all part of his grand scheme, and when the winds of change blew, he, the king, returned, with the power to overturn seas and move mountains, as a dragon ascended to the heavens!