Jaune could be a character created specifically for this fanfiction. Maybe he's a hero - in - the - making who is just starting to discover his abilities but is held back by his fear of funus.
There are likely some out there. You can start by checking popular fanfic websites like Archive of Our Own. Just search for 'female Jaune Arc x male' in the search bar, and you might find some interesting stories.
It could be that Jaune has some sort of traumatic past experience with funus, which makes him scared. Maybe he witnessed its destructive power or had a personal encounter that left him with deep - seated fear.
Jaune is the character who has been expelled, so he is central to the plot. His character might be dealing with feelings of betrayal, confusion, and a desire to clear his name. The OC, on the other hand, could be a very unique individual. They might have their own goals and motives that initially seem separate from Jaune's situation. But as the story progresses, their paths become intertwined. For example, the OC could be a healer who decides to help Jaune because they sense his innocence, and their relationship develops from there.
One common theme is friendship turned into love. Since they start as friends in the original series, many fanfictions explore how that friendship could evolve into a romantic relationship over time.
One common theme is the exploration of their relationship dynamics. Since they might have different personalities, fanfictions often delve into how they interact, argue, and make up.
One common theme is the exploration of their unlikely relationship. Given their different personalities and backgrounds in the original source material, fanfics often delve into how they might come together. Another theme is power dynamics, as Spike has his vampire nature and Willow has her growing magical powers.
Adventure is also quite common. They might embark on quests or travels in different fictional settings. For example, they could be exploring a mysterious ancient ruin together, looking for some lost artifact. And during this adventure, their bond gets stronger.
A lot of 'hunter x willow fanfiction' has the theme of adventure. Since both characters are in a world full of magic and danger, fanfictions often send them on new adventures together. Also, the theme of trust is quite prevalent. Hunter has had issues with trust in the past, and Willow is a character who values trust, so their relationship in the fanfictions often revolves around building and maintaining trust. And then there's the theme of discovery. They discover new things about each other, about their world, and about themselves as they journey together in these stories.