In this fanfiction, Izuku could be inspired by Batman's lack of superpowers but still being a formidable hero. He may start training in more martial arts and stealth techniques, similar to Batman. And he could even create his own set of gadgets, like grappling hooks and smoke bombs, to aid him in combat and rescue missions.
The Joker could be a great villain. Imagine if the Joker - like character emerged in the My Hero Academia world. Izuku, with his new Batman - inspired skills, would have to use his wits to outsmart this chaotic and unpredictable foe.
In the 'izuku becomes a girl fanfic', perhaps the plot involves Izuku adjusting to her new physical form. She might struggle with things like different clothing styles and how society views girls in the hero world. Also, her relationship with other characters could change. Her friendship with Ochaco might become more complex as they now have more in common as girls. And Bakugo might react in a really interesting way, either being more protective or even more competitive towards her.
It could be that the story focuses on how Izuku's character changes under Batman's training. Batman might teach him about the importance of preparation and having a backup plan. Izuku, on the other hand, could teach Batman about the power of hope and believing in oneself unconditionally. The fanfiction could also explore how Izuku uses the skills he learned from Batman in his own world, against villains like All for One, in a completely new and unexpected way.
One possible plot could be that Izuku suddenly finds himself with Loki's powers and memories. He has to deal with the newfound ability to deceive and manipulate, which goes against his usual honest nature. He might use these powers to outwit villains in a different way than he usually does in his own story.
Well, it could be about Izuku being an alien. Maybe he has some super - strange powers that are not like the normal quirks in his world. For example, he could have the ability to manipulate time or space, which would make him really different from other characters.
Maybe it's about Izuku using his wealth to support his hero training in unique ways. He could afford the most advanced support items and training facilities.
Perhaps a new villain could emerge who specifically targets Izuku because of her new gender identity. This villain might see her as a symbol of change in the hero society that they don't want to happen. So they constantly attack her and try to break her spirit, thinking that if they can stop her, they can halt the progress of female heroes in general.
The Joker could be a main villain. He might see Izuku as a new plaything and try to break his spirit during his training with Batman.
He might be motivated by a sense of futility. After years of fighting crime and seeing no real end to it, he could think that the only way to bring about change is to control the criminal underworld himself. So, he becomes a villain to enforce his own version of order.
One possible storyline could be that Jason Todd, after his resurrection, starts to see Batman in a new light. Maybe he begins to study Batman's methods more closely, realizing the good he was trying to do all along. He could start collecting Batman memorabilia and secretly helping Batman from the shadows, all while trying to come to terms with his own complex relationship with the Dark Knight.