A special time traveler, but when he was born, he mistakenly thought that he was half
"Assassin", thus actively choosing the assassin path...
"I'm so stupid, really... I only know that my characteristics are consistent with the Assassin Path, so I actively choose it. I don't know that there are other paths with similar abilities..." The Assassin Path - this is not a good one. The choice, of course, is not a bad one.
The end of the Fifth Age - this was the best of times, and of course, it was also the worst of times. This is a chaotic and crazy world, but it also shines with the light of humanity and hope.
This is a story where the protagonist saves himself and saves the end of the world. Note: There is a hidden original path, which will be slowly revealed as the plot develops.