My Hero Academia is a superhero shonen anime that generally has a positive and optimistic tone that will always inspire fans, but the series also has a dark side. Protagonist Izuku Midoriya/Deku may be a cheerful and upbeat kid, but he also knows how unfair or rough life can be, which helps keep him grounded as a character. For every scene of friendship and celebration in Deku's life, he also has a moment of despair, horror, or grief.
Source：https://www.cbr.com/mha-deku-darkest-moments/
