One common theme is friendship. Just like in the original series, the pets and their owners or the pets among themselves form strong bonds of friendship. For example, a dog might be extremely loyal to its hero owner and help them in times of need.
Another theme is the idea of the underdog (or under - pet in this case). Often, these pet fanfictions will have a small, seemingly weak pet that ends up being very powerful or having a crucial role to play. It's like the little guy making a big difference.
The theme of discovery is also prevalent. The pets might discover new powers or abilities, or they could discover secrets about the BNHA world. This adds an element of mystery and excitement to the fanfictions. For instance, a cat might find a hidden passage in UA that leads to an ancient power source.
One common theme is mystery - solving within the hero society. Detectives in these fanfictions often have to figure out who is behind certain villainous acts or strange occurrences. Another theme is the discovery of hidden powers or secrets related to the heroes. For example, a detective might find out that a hero has a secret ability that they've been hiding.
Another theme is the idea of heroism. Both shows revolve around heroes. Fanfictions might focus on how Ben 10, with his alien forms, would be perceived as a hero in the 'Boku no Hero Academia' world, or vice versa. For example, a fanfic could show Ben 10 using his powers to save UA students from a new threat. It also delves into what it really means to be a hero in different contexts.
A common theme is power. Both Naruto and 'boku no hero academia' deal with characters having unique powers. So, in fanfiction, it's often about how the characters' powers interact or compare. For example, Naruto's chakra control compared to the quirk control in 'boku no hero academia'.
One common theme is mentorship. Teachers in these fanfictions often take on the role of guiding students, like how they can better control their quirks. Another theme is the teachers' own backstories. Many fanfictions explore what made the teachers become educators in the first place.
One common theme is friendship evolving into something more. For example, two female characters who start as comrades in hero training might gradually realize they have romantic feelings for each other. Another theme is the struggle against society's expectations. In the 'Boku no Hero Academia' world, heroes have certain images to uphold, and a lesbian relationship might face challenges from the public or the hero community.
One common theme is the exploration of Stain's sense of justice. Since he has a very distinct view on what makes a true hero, fanfictions often delve into this concept, comparing it with the more mainstream ideas of heroism in the 'boku no hero academia' universe.
One of the main themes is Nejire's self - discovery. Fanfictions often show her learning more about herself, her strengths, and her weaknesses. Adventure is also common. Nejire going on various quests or missions, whether it's to save someone or to uncover a mystery. And then there's the theme of teamwork. Nejire working together with other heroes to achieve a common goal is a popular aspect in these fanfictions.
One common theme is cooperation. Since the world of 'boku no hero academia' has heroes and police, a lot of fanfictions explore how they can work together. For example, they might team up to take down a powerful villain. Another theme is the struggle for recognition. The police sometimes get overshadowed by the heroes, so some fanfictions focus on their fight to be seen as important.
One common theme is empowerment. Since female Izuku is often in a male - dominated world of heroes, these fanfictions usually show her rising above the challenges and proving herself. For example, she might have to face discrimination from some of the male characters at first but then shows them what she's made of.
One theme is the adaptation of the original story's power dynamics. In a genderbend harem fanfiction of Boku no Hero Academia, the powers might be used in different ways depending on the new gender of the characters. Also, friendship and rivalry often play a role. The characters in the harem may be friends who also compete for the affection of the main character, or they could be rivals who gradually develop feelings for each other.