One Piece: The Template System - Chapter 11: The Vow of the Grand Line

When he woke up, Luochen found that he had crossed over, and he was also carrying a ‘God-level landing system’.

One day, a game called “Pokémon OL” came to earth.

Everything in this game can be brought to reality.

And people in this world don’t know Pokémon at all, they don’t know anything about Pokémon.

The most important thing is that Luochen’s god-level login system can log in to the game a year earlier than others.

one year later……

The people who had just started logging into the game saw that above the sky, Luo Chen was commanding his elf to start a shocking battle with Rift Seat, smashing the sky to smithereens.

Their hearts were surging, and they vowed to become as powerful as this NPC!

But when the game’s world announcement sounded: “Congratulations to the player Luo Chen, defeating the sky lord Kaikongza!”

The whole world fell into an eerie silence.

…

- Description from novelbuddy

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

What happens when you transmigrate to Beast World? With the system in hand, the world is for your taking! One day, Su Tang, an intern at the hospital, is struck by a system and transmigrates to Beast World. It's a wondrous world with winged tigers, fire-spitting birds, and enticing man-eating flowers… Everything in this world leaves Su Tang awestruck!After the Chief of Winged Tiger Tribe saves Su Tang, she learns how backward this place was. Su Tang is determined to help change the world! Under the system’s guidance, she helps to extract salt, build homes, dig traps, make weapons and store food for winter… And perhaps even save the world while she's at it!

You thought being reincarnated as an extra-side character was bad? Imagine being thrown into the body of a villain who is disowned by his own family and discarded by the author.