Possibly the Greatest Alchemist of All Time :
“Possibly the Greatest Alchemist of All Time” refers to a fantasy story where the main character, Takumi Iruma, is accidentally summoned to a magical world and given the incredible power of alchemy, despite not being a traditional hero, making him potentially the most powerful alchemist in that world, even if he just wants a peaceful life; this is often used in the context of a manga or anime series with the same title where his overwhelming alchemical abilities draw attention even when he tries to avoid conflict