How about 'Giyuu x Shinobu: The Jealousy Factor'? This title clearly shows the relationship between the two characters and the key aspect of jealousy. It gives a hint to the readers about what the fanfic might be about, which is the jealousy that could exist in their relationship.
The plot could start with Shinobu noticing Giyuu getting a lot of attention from a new recruit. She starts to feel jealous as she realizes she has feelings for Giyuu. Giyuu, on the other hand, is oblivious to Shinobu's feelings and the new recruit's admiration, which causes more tension.
There are fanfictions where Shinobu and Giyuu are paired in a post - demon - slaying world. For example, they might start a new life together, perhaps helping to rebuild the demon - slayer corps in a different way. Shinobu's medical knowledge and Giyuu's combat skills could be combined in interesting ways in these stories.
You can find 'demon slayer shinobu x giyuu fanfiction' on popular fanfiction websites such as Archive of Our Own (AO3). There are a large number of fan - created stories there, and you can search for specific pairings like Shinobu and Giyuu. Just type in their names in the search bar and you'll get a list of relevant fanfictions.
One great 'shinobu and giyuu fanfic' is 'The Unspoken Bond' which delves deep into their complex relationship. It shows how they gradually come to understand and support each other in the face of various challenges in the Demon Slayer world.
First, study their characters. Know their personalities, backstories, and how they interact in the original story. For example, Shinobu is often calm but has a hidden fierceness, and Giyuu is a bit of a loner. Then, come up with an interesting plot. It could be about them going on a joint mission where they face a new type of demon. Keep in mind their relationship dynamics as you write.
Adventure can also be a big theme. They might go on quests or face challenges together, which strengthens their relationship. For example, in some fanfics, they have to defeat a common enemy while also dealing with their feelings for each other.
In kira x shinobu fanfic, character development is a crucial element. Both Kira and Shinobu will likely change and grow throughout the story. Their individual personalities, like Kira's perhaps being more impulsive and Shinobu's being more reserved, play a big role in how they interact. Also, the plot often revolves around a central conflict. It could be an external threat like an enemy they have to face together, or an internal struggle within their relationship, such as trust issues.
A common theme is the power dynamic between them. Given Shinobu's powerful vampire nature and Araragi's somewhat normal yet complex character, their relationship often plays with who has more influence at different times.
One idea could be a story where they are forced to team up on a dangerous mission in the demon slayer world. They start off not getting along well due to their different personalities, but as they face challenges together, they gradually understand and respect each other more.