One common theme is the exploration of Feitan's dark and mysterious nature. Writers often use the reader's perspective to slowly uncover his secrets. Another theme is the idea of an unlikely relationship. Since Feitan is such a complex and somewhat intimidating character, the relationship between him and the reader is often full of tension and growth.
A great one to check out is 'In Feitan's Shadow'. This story puts the reader in a position where they are constantly in Feitan's presence. It shows how they adapt to his ways and how their relationship slowly evolves over time. It's full of suspense and some heart - warming moments as well.
To develop their relationship realistically, start with small interactions. Feitan is a reserved and dangerous character. So, the OC should be cautious around him at first. Maybe they start with just a glance or a short exchange of words. As time goes on, the OC could show Feitan kindness in a way that he's not used to, like sharing food. This would slowly break down his walls. Also, the OC should have her own goals and personality that sometimes clash with Feitan's, which would add depth to their relationship.
The popularity of Feitan x Phinks fanfiction lies in their interesting personalities. Feitan is the silent and deadly type, while Phinks is more hot - headed. Their contrast makes for an exciting dynamic in fanfiction. Writers can explore how they interact, given their different natures.
One great Feitan x Phinks fanfiction is 'The Unspoken Bond'. It delves into their complex relationship within the Phantom Troupe. It shows how their loyalty to the troupe also extends to each other in a more profound way. Another one could be 'Silent Comrades'. This fanfic focuses on their shared experiences during missions and how they come to understand each other better over time.
One plot idea could be that the OC is a healer who stumbles upon Feitan after a battle. Feitan is initially suspicious but gradually warms up to her as she heals his wounds. Another idea is that the OC is a fellow member of the Phantom Troupe in disguise, and she and Feitan are sent on a mission together, leading to an unexpected bond. Or perhaps the OC is from a rival group, but she and Feitan find themselves attracted to each other despite their allegiances, which causes a lot of internal and external conflict.
The Hunter x Hunter manga is unfortunately not complete. The author has faced various issues that have led to intermittent breaks and an unresolved storyline.