Harry Potter: A Certain Ancient Rune Professor of Hogwarts (TL) - Chapter 9

Aomori, who has a monster-fighting system, came to the world of One-Punch Man and gained the ability to enter various instances.

Therefore, “Founder of the Hero Association”, “NO. “And other titles fell on him one after another.

Comprehensive flow, the main world One Punch Man.

Completed dungeons so far: Pokémon – Demon Slayer – Sword – Pokémon – Digimon – Spell Return – Yokai Comprehensive World (Girls that Noragami Inuyasha can see, etc.) – Pokémon – One Piece-re0-Dragon Ball wait.

- Description from novelbuddy

An ordinary (?) grandfather, Choi Chuntaek. In an effort to protect his granddaughter, he started the virtual reality game 'Arkstar.'

Then... he accidentally obtained a legendary class?

Lin Xun accidentally downloaded a word game called “Book of Salvation”.

Fighting monsters and upgrading, exploring and taking risks are just routine operations.

It’s fine if he can bring the game props to reality, but he found that he can actually bring the game characters into reality…

Although the game is extremely difficult, fortunately Lin Xun has a unique talent.

When other apostles can only use one game character…

Lin Xun looked at the rows of game characters and wondered which one to choose.

When the other apostles are still using the human characters of caiji…

Lin Xun has already used the powerful monster boss character.

…

When one day, Lin Xun manifested the terrifying and ferocious BOSS into reality…

“I said I’m here to save the world, do you believe me?”

“???”

“I believe you ghost?”

- Description from novelbuddy

A biker tries to save a cat on the highway and gets hit by a truck (Truck-Kun), he was rushed to the hospital but, due to internal bleeding, he dies only to be reborn as a cat, in a new world with a system.

In this new and vast world, he tries his best to get used to his new body and get stronger along the way. With his overpowered system and skills. To one day become untouchable.