Harry Potter: Ero World - Chapter 5: Gringotts! Part-3

In a world where martial artists reign supreme, strength is everything. Unfortunately, that logic doesn't apply to a certain Florida Man.

Refined in the nuclear fallout wasteland, Leo was the strongest mutant alive. He carried an alien artifact, allowing him to exchange his lifespan for modern items. After 50,000 years of solitary life in a humanless world, he collected enough lifespan to transmigrate to another habitable world.

Leo was later thrown into a mysterious planet. He soon discovered that his body produced radiation, and it mutated the surrounding plants and grasses. Worrying that he might ruin the beautiful planet, he chose to live in seclusion.

Unfortunately, the local population soon discovered his existence, and a misunderstanding ensued.

"Marry me. Once we're married, I will be loyal to you for life—as long as you keep me alive." Qiao Jiusheng was pushed into the water by her older twin sister, had her identity stolen, losing her old love and life. With no other choice, she seeks out Fang Yusheng, the blind man rumored to have no interest in women. With blank and empty eyes, he says, "Sure." In her past life, she was betrayed by her sister and trapped in the basement. Her tongue was cut off as she watched her sister take her place, winning overall her loved ones, marrying her lover of six years, and starting a family with him. Now that she's back to a time before it all went wrong, Qiao Jiusheng escapes from the river and goes to her boyfriend's older half-brother. She puts on a mask and marries him, to fight their common enemy. The wheels of fate begin to spin, and the severed threads of destiny are once again entwined... Before their wedding, he tells her, "Don't peek at me so openly just because I'm blind and can't see you." On the night of their wedding, he tells her," You don't have to dress like a bear. I don't care for women." Half a year after their wedding, just because she gives another man another look, Fang Yusheng covers her laptop, phone, bedside drawers, desk, and wallet with nothing but his selfies.

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

Everyone thought that the most powerful scientist they had ever seen was a national treasure-level scientist until they saw Baizhi-
The light of technology, a cosmic scientist.

Three thousand worlds are different.

In each world, she is keen on scientific research.

This is a story of a scientific researcher who concentrates on scientific research, explores high-dimensional science in various worlds, and refuses to admit defeat and fate. The text is easy to comprehend, flows smoothly, humorously, and the plot is full of ups and downs, and it is full of positive energy.

- Description from Novelupdates