What are the common themes in 'bnha kny crossover fanfiction'?

Sure. One popular 'bnha kny crossover fanfiction' is 'My Hero Academia in the World of Demon Slayer'. It combines the unique powers and characters from both series in an interesting way. Another one could be 'Demon Slayers at U.A. High', which imagines the Demon Slayers attending the school in My Hero Academia. There are also many more out there on various fanfiction platforms.

Perhaps there could be a plot where a villain in the bnha world discovers a way to summon demons from the kny world. This causes chaos as the demons start attacking the cities. The heroes and the Demon Slayer Corps then have to team up. The bnha characters use their quirks to support the kny characters in battles, like Bakugo using his explosions to create distractions while the kny characters go in for the kill.

Tanjiro and Deku would be a great pairing. Tanjiro's strong sense of justice and determination to protect his loved ones is similar to Deku's. They could learn a lot from each other, with Deku showing Tanjiro about quirks and Tanjiro teaching Deku about breathing techniques. Another interesting pairing could be Bakugo and Inosuke. They both have a fiery temper and are very competitive. Their interactions would be full of energy and probably a lot of arguing at first.

One idea could be to have characters from Boku no Hero Academia (bnha) and Demon Slayer (kny) participate in a joint training session. For example, Deku from bnha could learn some swordsmanship techniques from Tanjiro of kny. This would create an interesting dynamic as they come from different worlds with different power systems.

One common theme is mentorship. Snipe often takes on the role of guiding the reader character, whether it's in terms of combat skills or understanding the complex world of Bnha. For example, in many fics, he teaches the reader how to use different weapons.

One common theme is isolation. The depressed oc often feels alone, even in a school full of students like in U.A. High. They might think that no one can understand what they're going through.

One common theme is the exploration of Izuku's mental state. It shows how much pressure he's really under and what could happen if it becomes too much. Another theme is the reaction of the other characters. They have to deal with this new, changed Izuku.

First, understand the core elements of both universes. For bnha, it's the quirks and the hero society, while for kny it's the breathing techniques and the demon slaying corps. Then, find a common ground. Maybe a new type of threat that affects both worlds, like a group of villains who can use both quirks and demon - like powers. This can bring the characters together in a believable way.

The theme of loyalty also pops up often. They are shown to be extremely loyal to each other. In some fanfics, when one of them is in danger, the other will go to great lengths to protect them, no matter the cost, which really emphasizes the strength of their relationship.

A prevalent theme is loyalty. Whether it's his loyalty to the League of Villains or the possibility of a shift in loyalty. Also, the theme of power and how Kurogiri's unique powers are used or developed in different scenarios is quite common in these fanfics.