Irwin's Journey - The Cardsmith - Chapter 3: Sorcerer says

Aziz, a young orphan, had always known there was something different inside him. Despite the achievements and the luxury that surrounded him, he felt empty — as if something essential was missing.On a silent night, lost in thought, he fell asleep in search of answers.Little did he know that would be his last night in this world.——-Guys, this is my first time writing a novel. Support me with a gift if you can.

[Compatibility Level: 87%]

[Soul Transmission Successful]

[Character Creation Successful]

…

Legolas Baron, a man whose curiosity led him to pursue 3 successful careers as a zoologist, martial artist, and game producer has reincarnated in the world of the VR game that he created as a co-producer.

Unlike other reincarnators, Legolas was not intimidated by the prospect of reincarnation rather his curiosity became piqued by this phenomenon.

He wanted to know how he came to the world of the game that he co-produced. He wanted to understand the sorcery that was behind it.

To achieve his goal of getting to the bottom of how he reincarnated, he discovered that the only way to do it was to get to the peak of this game world.

Join this epic story as Legolas seeks the truth and sorcery that was behind his reincarnation by making use of his knowledge of the game to exploit invisible loopholes to establish himself as the Greatest Summoner in Dominator.

This is the story of how a man’s unshackled curiosity led him to the peak of strength as a Summoner.

A top hacker was chosen by the Lord God to be reborn into countless worlds, always as an expendable villain.

With no free will, every world became a dead end. Every one of his lives ended tragically.

Finally, after wresting control of the Villain System, this ace hacker decided to enact revenge. Even if his very bones were rotten, he’d choose to occupy the very heights of morality, if only on the surface.

Thus, he would change his fate as an abused slag.

- Description from novelupdates

A mecha otaku is reincarnated into another world as Ernesti Echevalier (Eru). In this world there exist huge humanoid weapons known as Silhouette Knight. Dreaming of piloting those robots, Eru, with childhood friends, Archid Walter and Adeltrud Walter: together they will aim to become a Knight Runner, pilot of Silhoutte Knight.