Isekai Maou to Shoukan Shoujo no Dorei Majutsu - Volume 1 Chapter 3.12

Yi Zaha. The crazy demon crazy for martial arts. While he was running away after stealing the heavenly pearl of the Demon Cult Leader, he fell off a cliff. After thinking that everything was over, he opened his eyes to see that he had returned back to when he was a waiter… And he is being beat up for something that he didn’t do. The crazy demon who returned to the beginning of his days as a waiter! Will he go crazy again, or will he drive his enemies crazy?

In a realm where even the faintest shadows whisper untold tales, I came to realize that the forgotten often hold the most powerful narratives.As an avid admirer of the world's most beloved series, I never imagined that one night's rest would pull me into its very fabric.“Why on earth am I stuck in this world? And why, of all people, am I him?”I had become Arthur Nightingale—Class A’s most unremarkable student. A magic swordsman barely worthy of mention, ranked 8th among the first-years. A mere footnote in the grand story.Still, with this body’s abilities and my own insider knowledge, I figured I could carve out a peaceful life. Or so I believed.“This was the only way,” the voice repeated, resolute. “The only way to stop her.”Little did I know how truly unique Arthur Nightingale was—or the path this journey would force me to take...

Crossing to One Piece world, he became Roger’s younger brother.

Unexpectedly, Gol-D-Roger who was in his fifties had a teenage brother. But he was so weak.

Fortunately, at the age of sixteen, he actually found himself with a possession soul system.

He had attached to the master IP man, also to the White Phoenix and to Ge Nie with his strong ability of the Hundred Step Flying Sword.

If you think that he can only Purchase these? Then you’re wrong!

Pain, Itachi, Ichigo Kurosaki, as long as there is money, any soul can be Purchased.

- Description from Novelupdates

What? Your future wife is a peerless killer, an underground queen?

Sorry, just killed her the other day.

…

I heard that your girlfriend is the famous champion of China, the dream lover of countless people?

Um, she was too tired and fell asleep at night, you can come to her tomorrow.

…

I remember that the abandoned store of the second uncle seemed to be bought by someone in a month or two.

Hurry up and exchange the useless places in the training house with your cousin for the abandoned store.

Then resold at a price of 10 million alliance coins.

…

What?

Xu Yang rescued a legendary elf and took care of it for a month.

Yi Lam knocked Xu Yang unconscious with a sap and threw him out.

The legendary elf who regained consciousness saw Edward Lam.

He was so grateful to him that he willingly became Edward Lam’s elf.

- Description from novelbuddy