One great fanfic in this genre is 'Quirkless in a Quirked World'. It really delves into how Izuku, being quirkless like Saitama in OPM (in the sense of starting from a disadvantaged state), overcomes challenges. The story shows his determination and how he adapts Saitama - like training methods to become a great hero in the My Hero Academia universe.
Yes, the OPM manga has come to an end. The creators completed the narrative, providing closure to the fans. Although some might have hoped for more, what was presented was a comprehensive and conclusive tale.
Definitely! The OPM manga offers a lot of action, humor, and interesting storylines. The art style is also top-notch, which adds to the overall enjoyment. But, of course, it depends on your personal taste in manga genres.