I think Midoriya's reaction would be the most interesting. He's such a huge hero fan and analyst. He'd dissect every aspect of Batman in the fanfiction, from his combat skills to his psychological state. He might even start theorizing about how Batman could exist in the MHA world and what kind of Quirk he could have.
They would be very powerful. Just like Naruto can summon giant toads, this character could summon toads in the MHA world. They could use the toads as mounts or have them fight alongside. For example, they could have a toad use its tongue to grab villains and hold them in place.
Ladybug and Deku would be a great pairing. Ladybug is a strategic and powerful leader in her world, and Deku has his own unique way of analyzing situations and his determination. Together, they could share their knowledge about combat and heroism. Deku could learn from Ladybug's experience with magic - based powers, and Ladybug could learn about different Quirks from Deku.
She would probably become more protective. Not only of herself but also of her unborn child. This could manifest in her being more vigilant about her surroundings, more careful about who she trusts, and more assertive in ensuring her safety and the safety of her future baby in the often - dangerous world of MHA.
I think Kakashi and Aizawa would be a great pairing. They are both experienced teachers who are quite laid - back but can be very strict when it comes to training their students. They could exchange teaching methods and stories about their students. Also, Hinata and Ochaco would be an interesting pair. Hinata's shyness and strong - willed nature combined with Ochaco's bubbly and kind personality could lead to some really cute interactions.
One good My Hero Academia (MHA) fanfiction is 'Deku: The Quirkless Wonder'. It focuses on Izuku Midoriya's journey without a quirk in a really interesting way. The character development is on point and it adds new twists to the original story's plot.
One great story in MHA is about Deku's journey to become a hero. He starts as a quirkless boy but through hard work and determination, he manages to enter the hero academy and grow in power and confidence.
To some extent, it is popular. There are many online platforms where MHA adult fanfiction can be found. The popularity might stem from the fact that the MHA world has a rich cast of characters and a complex universe. Fans who enjoy adult - oriented storytelling might use these characters to create their own narratives that are more in line with their interests in terms of relationships, power dynamics, and personal growth, all with an adult twist.
Several characters have met their demise in the MHA manga, but it's a bit complex to list them all precisely. Some of the notable ones include [mention specific characters if known].