One common theme is heroism. The main character, the ice dragon slayer hero, is often portrayed as brave and selfless in the face of danger. Another theme is the battle between good and evil, with the ice dragons usually representing the evil force.
I really like 'Quirked Slayers'. In this fanfiction, the author does an amazing job of integrating the quirk system into the Demon Slayer world. It's full of action - packed scenes where the heroes use their quirks to battle demons. It also has some great character development, especially for the characters that are a fusion of the two franchises.
The popularity of My Hero Academia Demon Slayer fanfiction lies in the combination of two very popular anime. Fans love to see how the unique elements of each can be mashed together. For example, the cool quirks from My Hero Academia and the intense demon - slaying action from Demon Slayer.
There is this 'the ice dragon slayer hero fanfiction' called 'The Ice Dragon Slayer and the Lost Kingdom'. In it, the hero not only has to slay ice dragons but also find a way to restore a lost kingdom that has been frozen in time. The story is full of action and adventure as the hero battles the powerful ice dragons and uncovers the secrets of the lost kingdom.
In some fanfiction, the characters might swap worlds. Tanjiro could end up in the world of My Hero Academia and try to understand the concept of Quirks while also showing off his sword skills. Maybe he'd even team up with Uraraka to take on villains. It would be really cool to see how they interact and learn from each other.
The Doom Slayer could be a mysterious figure in the My Hero Academia fanfiction world. He might be from a parallel dimension where his fight against demons is similar to the heroes' fight against villains. He could team up with the likes of All Might or Deku, teaching them about his unwavering determination. His presence would add a new level of intensity to the battles, as he doesn't hold back and is used to facing much more terrifying foes than the average villain in My Hero Academia.
He could have a 'Rage Quirk' that makes him stronger the angrier he gets, which would be in line with his character in Doom. When he's in a fight, his anger just builds and builds, and his physical strength and combat abilities skyrocket.
One possible plot could be that the heroes from My Hero Academia are transported to the Demon Slayer universe. They team up with the Demon Slayers to fight a new breed of demons that have quirks. Midoriya could learn some sword - fighting skills from Tanjiro and in return, Tanjiro could gain some knowledge about using quirks in combat.
One idea could be that the Demon Slayers are brought into the world of My Hero Academia. Tanjiro could learn about quirks and try to figure out how to use his skills in this new environment. Maybe some of the demons also gain quirks which makes them even more dangerous.
Well, All Might is also a very strong character from My Hero Academia. His sheer power and experience could make him a tough opponent for any demon slayer. However, the upper - rank demons in Demon Slayer have their own unique and terrifying abilities. For instance, Kokushibo with his sword skills and multiple eyes. In a one - on - one battle, it would be a close call between them depending on how the fight unfolds.