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.
You can try fanfiction websites like Archive of Our Own (AO3). There are often a large number of fanfictions about various pairings, including muichiro x yuichiro. Another option is FanFiction.net, but the content quality may vary. You can also check out some dedicated anime or manga fan communities where fans might share their own written fanfictions or recommend good ones.
Overcoming obstacles is a big one. There could be external factors like disapproving friends or family, or internal issues like insecurities that they have to face and overcome in order to be together in the fanfiction. This makes the story more engaging and relatable as it shows the challenges of a relationship.
I'm not entirely sure specifically what 'aoi x ginji light novel' is about without more context. It could potentially be a story about the relationship between two characters named Aoi and Ginji. It might involve elements of adventure, friendship, or a unique fictional world setting.
One common theme is the development of their relationship. It could start from friendship and gradually turn into something more romantic. Another theme is the support they give each other in achieving their goals. For example, if they are in an anime where they have some kind of mission or dream, they might encourage each other in fanfiction.