One great 'Muichiro x Reader' fanfiction is 'A Meeting in the Mist'. It beautifully captures Muichiro's somewhat aloof nature while gradually developing a sweet relationship with the reader. The descriptive language used really makes you feel like you're in the Demon Slayer world with them.
Another interesting one is 'Kotetsu's Training Days'. This fanfiction delves deep into Kotetsu's training regime. It shows how he overcomes difficulties, learns new jutsu, and forges strong bonds with his training partners. It gives a great insight into his character development.
One great 'naruto kotetsu fanfic' is 'Kotetsu's Journey'. It really delves into Kotetsu's character, showing his growth from a relatively unknown shinobi to someone with a more significant role. It has a great plot that weaves in with the main Naruto storyline in an interesting way.
Well, Naruto would likely be one of them. He has a big heart and would surely want to help his fellow villagers. Sakura could also be involved as she is a skilled medical ninja. She could use her medical knowledge to diagnose and treat their illness.
One common theme is the deep emotional bond between them. Given their relationship in the original work, fanfictions often explore how they support and care for each other on a more profound level. Another theme could be adventure, where they go on quests together and their relationship develops during those experiences.
The relationship development between Muichiro and the reader has to be believable. It can't be too rushed. A slow - burn, where they gradually get to know each other, understand each other's quirks, and form a deep connection over time is much more appealing. Also, the setting should be in line with the Demon Slayer universe. Whether it's in the Demon Slayer Corps headquarters or on a mission, the details of the world should be well - described.
Muichiro's death in the manga occurs during a particularly intense confrontation. His injuries accumulate, and he ultimately succumbs despite his valiant efforts.