He might do it for a bet. Just like some friends might bet on who can pull off a crazy stunt, his friends could have bet him that he can't dress like a girl and act the part for a certain period.
Obviously, Bakugo would be one of the most affected. His relationship with Izuku has always been complex, and Izuku becoming a girl would surely change the dynamic between them. He might have to re - evaluate his feelings of rivalry and superiority. All Might would also be affected. As Izuku's mentor, he would need to adjust his training methods and support system to fit Izuku's new situation as a girl.
Well, it depends on how the author of the fanfic has characterized Figure 13. However, if the premise is that Figure 13 is a girl in this fanfic, then that's how it is within the context of that particular story. Different fanfics can have different interpretations and characterizations, but in this one, it's stated that Figure 13 of Izuku is a girl.
Izuku might become more self - conscious about her appearance in this fanfiction. Since she is a girl, she could face different beauty standards, which may influence her confidence in different ways compared to when she was male - presenting in the original story.
She could be an ordinary girl who just happened to be at the right place at the right time and caught Izuku's eye. Maybe she was at a hero event and Izuku noticed her kindness towards the other attendees.
Self - discovery is a common theme. Izuku has to figure out who she really is as a trans girl in a society that has certain expectations. Another theme is acceptance, both self - acceptance and acceptance from others like friends, family and the community.
Well, it could start with Izuku waking up as a girl one morning with no explanation. He (now she) tries to keep it a secret at first but then realizes it's not possible. The story could focus on how Izuku's relationships change. For example, Bakugo might initially tease her more harshly but then come to respect her in a different way. And Midoriya could find that she has a different approach to using her quirk as a girl, maybe being more strategic or having different physical capabilities that she has to learn to master.
People write 'izuku is a girl' fanfic because it offers a fresh perspective on the original story. It allows them to explore different character dynamics and plot possibilities. By changing Izuku's gender, the interactions with other characters, like Bakugo or All Might, can be re - imagined in new and interesting ways.
A great 'izuku is a girl' fanfic could focus on her relationship with other characters. Maybe she has a closer bond with Ochaco as they are both girls now. They could support each other more in their hero training, and Izuku could also inspire Ochaco in different ways. It could be really interesting to see how the dynamic between the characters changes with this gender swap.
Perhaps in this fanfiction, Izuku as a girl might face different challenges in the hero world. Society could have different expectations of a female hero, which would add a new layer to her character development. She might have to deal with sexism while trying to prove herself as a capable hero, just like real - world female heroes often do.