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.
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.
The Hunter x Hunter manga has indeed concluded. However, the ending might have left some fans wanting more or with mixed feelings depending on their expectations.