Love and support is also a big theme. Some fics take their relationship to a romantic level, showing how they love and support each other through thick and thin. They might comfort each other after a tough battle or just be there for each other during a bad day.
There's also 'Mic and Aizawa: Unseen Bonds'. In this fic, the author focuses on how they support each other during difficult times at UA. It shows their friendship evolving into something deeper and more profound, with a lot of heart - warming scenes.
A present mic fanfiction could focus on his relationships with other heroes. He seems like a really friendly and outgoing guy, so it could be about his adventures with Eraserhead. They could be solving a mystery together in a noisy city, with Present Mic using his voice to disrupt villains while Eraserhead takes them out.
A theme could also be his heroic deeds. Fanfictions could be written about him saving a large group of people from a powerful villain using his sonic powers in creative ways, like creating a sonic shield to protect them or using his voice to confuse the villain into making mistakes.
I'm not entirely sure specifically as there could be various plotlines. But generally, it might be about a character named Present Mic and his adventures, relationships, or his role in a particular fictional world. It could also involve his powers if he has any in the context of the light novel.
Since I haven't read it, I'm not sure, but of course Present Mic is likely one of the main characters. There may be other characters associated with him, like his friends or colleagues if it's set in a workplace - like or team - based story.
Some fanfictions also explore the idea of a romantic relationship between them. They might show how their friendship could potentially develop into love over time, with themes like hidden feelings and the discovery of new emotions for each other.
The popularity of 'Present Mic adopts Izuku' fanfictions lies in the fact that it explores an uncharted territory in the My Hero Academia universe. It combines the underdog story of Izuku with the zany and positive character of Present Mic. People love seeing how Izuku can grow and develop under Present Mic's care. It also allows for some creative storytelling as it can involve Present Mic using his voice - related quirk in new and unexpected ways to help Izuku. Additionally, it gives a chance to show a more nurturing side of Present Mic which is not often explored in the original series.
Well, there's a fanfiction called 'Mic's Adoption Adventure'. In it, Present Mic stumbles upon Izuku being bullied for being quirkless. Feeling a sense of protectiveness, he adopts Izuku. This fanfic delves into how Izuku starts to gain confidence with Present Mic's constant encouragement. And then there's 'Izuku and His New Dad, Present Mic' which is really interesting as it shows the daily life of them together. Present Mic uses his unique teaching methods to help Izuku not only in hero training but also in academics.