One way to develop their relationship further is to put them in a situation where they have to make sacrifices for each other. For instance, if Gon is in a life - threatening situation and Kurapika has to use all his resources and powers to save him, or vice versa. This would show the depth of their friendship and loyalty, and also add more layers to their relationship in the fanfiction.
In fanfiction, their relationship can be deepened if they exchange stories about their pasts. Gon could tell Kurapika more about his father, and Kurapika could open up about his clan. This would create a more intimate connection between them.
A really interesting plot could be set in an alternate universe where Gon and Kurapika have different roles. For example, Kurapika could be a carefree adventurer like Gon usually is, and Gon could be more focused on revenge like Kurapika. This role - reversal would create a whole new dynamic between them and could lead to some really unique storylines.
In Kurapika - centric fanfiction, gender can be explored in various ways. One way is through gender - bending concepts. For example, a writer could create an alternate universe where Kurapika is of a different gender. This could lead to interesting changes in his relationships, his goals, and how others perceive him. His interactions with the other characters like Leorio, Gon, and Killua would take on new dimensions. Maybe as a female Kurapika, his protectiveness over his clan's eyes could be seen as an even more profound and complex trait, as it might be intertwined with different cultural and gender - based expectations.
Characterization is key. A great Kurapika fanfiction really nails his complex personality. His loyalty, his anger towards the Phantom Troupe, and his internal struggles should all be well - presented. For example, if it's a story about Kurapika during his revenge journey, it should show how his emotions are constantly in flux.
She's often portrayed as a mysterious figure. Since we don't know much about her in the original series, fanfiction writers have a lot of freedom. Some portray her as a powerful and kind - hearted woman, like an angelic figure who left Gon for a noble reason, perhaps to protect him from a great danger that only she could face.
A prevalent theme is the struggle between good and evil. Kurapika is often seen as a symbol of good, while Chrollo represents evil. Fanfictions play around with this dynamic, sometimes blurring the lines between the two. Also, the theme of trust is common. Given their history, it's interesting to see how fanfiction authors make them build trust in each other, like in a story where they have to rely on each other's skills to survive a dangerous situation which spans over a long journey.
One common theme is the struggle with traditional gender roles. Kurapika, regardless of his original male gender in the series, can be written to defy or conform to certain gender - related expectations. For example, his role as a protector could be emphasized in a more feminine - coded way, like being nurturing while still being strong, which is a contrast to the often more stoic male protector archetype.
You could also check out Tumblr. There are often fanfic recs (recommendations) on Tumblr blogs dedicated to Hunter x Hunter. Some bloggers will share their favorite Kurapika fanfictions, and you might discover some really interesting and unique stories that way.
I really like 'Hisoka's Obsession'. It shows Hisoka's fixation on Gon in a more detailed and somewhat darker way. It adds layers to Hisoka's character while also developing Gon's reactions to Hisoka's strange behavior. The writing style is engaging and it's easy to get lost in this alternative take on their relationship.
Check out fan communities on social media platforms such as Reddit or Tumblr. There are often posts where fans recommend their favorite 'Hunter x Hunter Gon x Killua' fanfictions. You can also join relevant groups or follow specific tags to stay updated on new and good fanfictions.
One common theme is growth. Fans often write about Gon growing in power and wisdom. For example, in many fanfictions, Gon discovers new Nen abilities and learns how to control them better.