The theme of growth might be present. As the relationship progresses, the characters may grow and change. Also, the theme of society's views on such relationships could be explored, as it's not a common relationship type in society.
One of the main themes could be the exploration of power dynamics within relationships. Given that one is a teacher and the other a student, there are power imbalances that come into play. Also, self - discovery might be a theme as the characters navigate this unorthodox relationship and how it affects their understanding of themselves. Another possible theme is the idea of breaking social norms and the consequences that follow.
The Boku no Hero manga is finished. It reached its conclusion after a successful run, leaving fans with a complete narrative and memories of an exciting journey.
Indeed, Koro Sensei passes away in the manga. This event is both emotional and crucial to the story's conclusion, leaving a lasting impression on readers.