While not an isekai, Inuyashiki is one of the few anime that comes readily to mind when we think of the protagonist not being a young teen but an adult who has decades of life already on their shoulders. The World’s Finest Assassin also has an older protagonist but this one is an even OLDER man who isn’t an otaku or a pervert but a man who kills as his primary job.

The assassin—who later is renamed to Lugh De Tuatha—is an assassin who is about to retire to become a teacher—who teaches others how to kill—when he’s betrayed and killed by his benefactors. This entire setup allows our unnamed assassin to be reincarnated as a young boy with the mind and skills of an older gentleman. We love that the main character for The World’s Finest Assassin isn’t the typical copy and paste of an isekai hero but is someone with wisdom and talent after having been alive for so long.

The World’s Finest Assassin also set ups in an unusual way. Our MC isn’t the hero—but kind of is, oddly enough—but is meant to assassinate the hero who will, in time, become the world’s main reason for self-destructing. In series like The Rising of the Shield Hero or Re: Zero, we witness main protagonists not really being the hero but still being literal heroes in their own way. Lugh is a killer and clearly has killed many people before which makes him a surreal protagonist to root for and watch.

Many isekai protagonists are pretty OP from the beginning but Lugh might be one of the rare exceptions to being both OP and intelligent. Lugh himself was able to choose his starting abilities which immediately allowed him to hone and level them up. One of his starting skills was a means to constantly evolve and gain power, meaning Lugh could easily surpass the hero in strength if he continues to hone his own talents and skills. Plus, with his perfected assassination skills—he is considered the finest assassin in the title—Lugh is quite adept at carrying out missions and adapting as the needs arise. It might be possible that Lugh is the most OP hero from an isekai in some time…

Easily one of the most interesting things about The World’s Finest Assassin is the story itself. Many isekai rely on using ideas from other series—Konosuba is about saving the world from a Demon King and the same story can be found in Cautious Hero: The Hero Is Overpowered but Overly Cautious—but The World’s Finest Assassin isn't trying to copy these stories. Instead, Lugh himself is being told to kill a target to save the world. As the story progresses, The World’s Finest Assassin is proving that isekai stories can follow tropes from other works but make them unique.