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.
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.
Once there was a girl named Lily. She was very into fitness. Every day, she would do hundreds of sit - ups and crunches. Her dedication to getting strong abs was amazing. She started from being a bit chubby but with her consistent effort, she gradually built up those abs. She often inspired other girls in the gym with her transformation story.
Well, fanfiction often takes elements from an existing source. In the case of abs120 fanfiction, it could be that 'abs120' is a code or name within a certain fandom. Maybe it's a story that expands on the adventures or relationships of characters associated with this 'abs120'. It could be a story set in a science - fiction world where 'abs120' is a technology, or in a fantasy world where it's a magical entity. There are so many possibilities.
I'm not sure specifically as it could be a fan - made fictional story related to Aladdin that focuses on his abs, perhaps it's a creative take on Aladdin's physical appearance in a new story written by a fan.