MTL - The Existence of Harry Potter - ~ one

[Ding!][Welcome to the fantastic world of Aether Babes!!!][Title granted: King of the Cosmos!]In his first life, Nick was an avid gamer. One of the top-ranking players in the gacha game Aether Babes, he never thought in a million years he'd be transmigrated into the world of his favorite game.However, it wasn't everything he imagined it to be. Somehow all the gods were dead, leaving him as the new King of the Cosmos far earlier than his character was supposed to be. More than that, it seemed like his favorite game actually contained the worlds of many different games...And as the King of the Cosmos, it was his duty to conquer every game, obtaining ultimate power.Finding himself in a dangerous plane of existence filled with exotic monsters and demons and even more nightmarish creatures he never dreamed of fighting in real life, Nick has to fight relentlessly just to stay alive. Luckily, he has the help of his favorite waifus!

His Royal Highness the King of Han, who was afraid of the dark and ghosts and loved to cry, has always been the good baby of the princess.
Until one day, His Royal Highness the King of Han found a book in the bookstore…
Picture book?
Content tags:
Search keyword: Protagonist: King of Han, Princess of Han

- Description from novelbuddy

In short, MC inadvertently created a world, but as the creator of the world, he did not know the world at all. He should have lived here like a fish in the sea with some plug-ins that MCs always have. But now he is even stumped by the bugs in the instant world. Luckily, in this world he has found his shadow guard, or his lover? So the daily adventure is getting not so boring…

- Description from Novelupdates

An ordinary medical student suddenly got the blessing of the system and could directly see the patient’s health! Since then, treating illnesses and saving lives has become commonplace, and he has also become a legend in the medical field.

- Description from novelbuddy