My Hero Academia takes place in a world where 80% of the population has a quirk. The anime does a fantastic job of introducing a world filled with superpowers, addressing hero politics, and keeping up with the development of all its characters. As with every series, My Hero's fandom have come up with a set of unique fan theories.
These fan theories are some of the best and most compelling in the fandom. These fans have crafted spectacular theories using evidence from the show and creativity. Some focus on character development, while others focus more on significant events like the quirk singularity. Though these ideas are not canon, the evidence supporting them makes it hard to imagine that they're not at least possible within the series' universe.
Related: My Hero Academia: Why Does Fumikage Have a Bird Head?
Katsuki Bakugou stands out as the hot-headed frienemy of the main character, Deku. His quirk allows him to secrete nitroglycerine from his hands to create explosions. The more he sweats, the bigger the outbreaks are, but fans realized that his quirk could potentially injure him. An essential safety requirement for explosions is earplugs or even noise-canceling headphones. This is due to the fact that explosions can cause severe damage to a person's hearing. This has led many fans to theorize that Bakugou is losing his hearing.
Besides the fact that Bakugou's hero costume now has protection for ears, a couple of other things from the anime support this theory. Of course, part of Bakugou's character trait is yelling, but what if there was more to it. Some fans think that Bakugou's yelling has to do with hearing loss. He's unaware of how loud he's talking, and other times he's frustrated that he can't hear the others.
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