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The World's Finest Assassin Reincarnated In Another World is yet another reincarnation isekai story, but one with quite a unique setup where the protagonist actually 'chooses' to become some background character in a very sort of way.
Source: https://gamerant.com/isekai-anime-manga-protagonists-reincarnated-as-background-side-characters/
This literal godsend was so conveniently overpowered and conceptually lazy that it gave In Another World with my Smartphone its infamy as one of the most transparently wish-fulfilling isekai.