Harry Potter: A Certain Ancient Rune Professor of Hogwarts (TL) - Chapter 520

Kaden awakens once again at the dawn of Earth’s cataclysmic “System” invasion, armed with haunting memories of his previous nightmare life. Desperate to overturn his grim fate, he sets his sights on a special druid class—only to unlock a legendary hidden class!A druid who had to devour to become stronger!With every enemy he devours, the madness increases. The nature twists and contorts in his presence. Plague spreads where he goes. The cursed forests become his grove.Would the fallen druid be able to face the twisted alchemist who once enslaved the entire planet? Can Kaden master this cursed power to save humanity—or will it consume him, turning him into the very evil he seeks to destroy?

The constant mission is getting redemption.

Shuttle though various worlds to become a variety of scum men, do a little whitewashing and become a good man in the eyes of everyone.

Redeem those who are miserable, and let them live a happy life.

- Description from Novelupdates

Yours Truly shall have all of you bow down to me!

Arriving in this brand-new world, Lin Fan found himself in possession of a system which allows him to level up indefinitely unbounded by the limitations of this world. Upon learning a powerful technique of Monkey Steals Peaches, Lin Fan realises that he’s poised to literally become the strongest person in this entire world. But of course, how boring would that be unless the whole world gets to know about his great name?

Shameless. Righteous. Smart. Lin Fan will let no one (or balls) stand in his way to glory!

- Description from Novelupdates

This is a world where humans, demons and mysterious beasts coexist.

Humans cultivate mysterious qi. Demons cultivate corporeal bodies. Mysterious beasts cultivate soul perception.

A legend says that in the middle of an endless rainforest, there are extremely powerful existences; they are called demon kings.

Some demon kings have a tyrannical corporeal body, some are experts in illusions.
Some demon kings are proficient in magic, some can even move mountains.
Some demon kings are able to sense things thousands of miles away.

These demon kings rarely appear in the human world. Even if they emerge in the human world, they would reincarnate in human form; assimilating with mankind while seeking to breakthrough realms…

- Description from Novelupdates