A common theme is their shared work environment. Since they both are part of the U.A. High School faculty, many fanfictions explore how they deal with the daily chaos of teaching and protecting the students. Another theme could be their contrasting personalities. Nezu is very intelligent and calm, while Present Mic is more energetic and outgoing. Fanfictions often play with how these different personalities interact and complement each other.
One place to find Nezu x Present Mic fanfiction could be Archive of Our Own (AO3). There are often various fan-written stories exploring different aspects of their relationship, from friendship to more unique interpretations. Just search for 'Nezu x Present Mic' on the site and you'll be presented with a selection of fics to choose from.
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.
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.
One common theme is friendship. They are colleagues in the My Hero Academia universe, and many fanfictions explore the deepening of their friendship, like how they support each other through tough times at work or in battles.
Some fanfictions also have a mentorship theme. Since Allmight is a very experienced hero, he could potentially be a mentor to Present Mic in certain aspects. This could involve training, or guiding him in making important decisions. And of course, there are some fics that explore a more romantic relationship between them, though this might not be as common as the other themes.
One more theme is the exploration of their quirks together. Present Mic's sound - based quirk and Eraserhead's erasing quirk can be combined in really creative ways in fanfics. Writers often use this to create unique battle scenes or problem - solving situations, which adds an exciting element to the stories.
A frequent theme is the backstory exploration. Writers often create scenarios where we learn more about their pasts and how those pasts might have led to their current relationship. There can also be themes related to hero training. Maybe they team up to train students in some fanfictions, and we see how their teaching styles blend or clash. Also, some fanfictions explore the idea of them facing a common enemy together and how their bond grows stronger through that experience.
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.
One possible theme could be the loss of innocence. Present Mic, who is usually seen as a jovial character, could be shown losing his positive outlook as he is exposed to the darker side of the hero world. Another theme might be betrayal. He could be betrayed by someone he trusts, which would send him on a dark path.
One great 'Present Mic x Eraserhead' fanfic is 'Echoes in the Classroom'. It beautifully explores their relationship within the UA High School setting. The story delves into how their different personalities complement each other. Present Mic's exuberance and Eraserhead's calmness create an interesting dynamic.