One common theme is the crossover of two different universes. Since Izuku is from My Hero Academia and RWBY has its own unique world, exploring how they interact and collide is a big theme. Another is power growth. Izuku usually has his own set of powers and abilities, and in the RWBY world, he either adapts or combines his powers with the RWBY characters' abilities. Friendship is also a common theme. As Izuku meets the RWBY characters, they form bonds and go through adventures together, just like in their respective original stories.
Well, a frequent theme is the clash of cultures. Izuku comes from a world with a different social structure and set of values compared to RWBY's world. Fanfictions often explore how he copes with this and how the RWBY characters react to his different ways. Survival is another theme. The RWBY world is full of dangerous Grimm, and when Izuku enters this world, he has to learn to survive in this new and dangerous environment. Also, the theme of self - discovery is present. Izuku may find new aspects of himself or his powers in the RWBY world, and the RWBY characters may also learn something new about themselves through their interactions with Izuku.
One common theme is friendship. They often start as friends and then their relationship may grow deeper. Another theme is support. Izuku might support Fuyumi in her personal struggles, like dealing with her family's expectations. And Fuyumi could support Izuku in his hero journey.
A major theme is the struggle against overwhelming expectations. Izuku has high expectations from himself and others in the world of the story. When he fails to meet them, it leads to his depression. Also, the theme of lost hope is common. He might lose faith in his dreams and his ability to become a hero. In some fanfictions, his depression is also linked to past traumas, like being bullied for not having a quirk initially.
One common theme is the struggle with identity. Izuku has to come to terms with being a vampire in a world where he was previously a normal human. Another theme is isolation, as he may feel different from his friends and classmates. And often there's a theme of power, exploring how his vampiric powers change his role in the hero - related events.
One common theme is Izuku's growth and development. Since he's older, he might have more advanced skills and a deeper understanding of his quirk. Another theme could be his relationships, perhaps more complex romantic relationships or stronger friendships with his peers.
One common theme could be redemption. Izuku may be expelled unjustly, and the story could focus on his journey to prove himself and regain his place in the hero world.
Another theme is mentorship. Sometimes, female characters take on a mentorship role for Izuku. They might have different skills or knowledge that they impart to him, like unique fighting techniques or strategies.
One common theme is the development of their relationship from rivals to something more. Given their original dynamic in the source material, fanfictions often explore how they can overcome their differences. For example, in many stories, they start to understand each other's motives and goals better.
One common theme is the 'opposites attract' idea. Since Mina is more outgoing and Izuku is initially shy, this contrast makes for an interesting dynamic in the stories.
One common theme is friendship. They often start as classmates and gradually become close friends, relying on each other. For example, in many fics, they help each other deal with family issues like Todoroki's complex family situation and Izuku's insecurities.
A lot of these fanfictions also deal with the idea of romance. Given the popularity of shipping in the My Hero Academia fandom, it's no surprise that many stories focus on romantic relationships between Izuku and the 1a girls. Some might explore how they handle jealousy when other characters are involved in Izuku's life. And there are often themes related to self - discovery too. As the characters interact more closely with Izuku, they might learn more about themselves, their feelings, and their own potential as heroes.