20 : Yuuki Kagurazaka <RELIABLE>

: Introduced in Episode 20 of the anime (titled "Yuuki Kagurazaka") as the Grandmaster of the Free Guild and an "Otherworlder" like Rimuru.

Yuuki is one of the most versatile and dangerous characters due to his ability to adapt and counter magical systems. 20 : Yuuki Kagurazaka

In the context of That Time I Got Reincarnated as a Slime ( Tensura ), is a central character whose role shifts significantly between his first appearance and the series' endgame . 1. Character Overview & Role : Introduced in Episode 20 of the anime

: While appearing as a friendly ally and a "geek" who shares culture with Rimuru (like discussing Final Fantasy games), he is eventually revealed to be a master manipulator and a major antagonist. 20 : Yuuki Kagurazaka

Yuuki Kagurazaka (episode) - Tensei Shitara Slime Datta Ken Wiki