Often, there is the theme of mentorship. Hisoka, in a strange way, can be seen as a mentor to Killua, guiding him through the darker aspects of the world they inhabit. Also, the theme of loyalty and betrayal is common. Given Hisoka's unpredictable nature, there are fanfics where Killua has to deal with the possibility of Hisoka betraying him or vice versa. And there's the overarching theme of self - discovery for both characters as they interact with each other.
One common theme is the exploration of power dynamics. Hisoka is much more powerful and experienced, and Killua is a prodigy. Their relationship often involves Hisoka testing Killua's limits. Another theme is the idea of redemption or change. Hisoka is a rather amoral character, and in some fanfics, Killua might influence him to change for the better.
The theme of trust is prevalent. Since Hisoka is so unpredictable, Killua has to decide whether or not to trust him, and this forms a major part of many fanfics. Another theme is the exploration of the characters' pasts. How their different upbringings shape their relationship in the fanfics. And there's also the theme of friendship, albeit a very strange and complex one, that develops between Hisoka and Killua in these stories.
One common theme is the exploration of power dynamics. Hisoka is much more powerful than Gon and Killua at first, so fanfics often play with how they either try to overcome this gap or how Hisoka uses his power in relation to them.
One popular theme is adventure. Since Gon and Killua are often on adventures in the original story, fanfictions may continue this trend while adding the element of Hisoka's interference. Another theme is the exploration of power dynamics. Hisoka is much more powerful than Gon and Killua at first, so how they grow to face him or interact with him in terms of power is interesting.
One common theme is the exploration of an unusual relationship. Given Hisoka's eccentric nature and Gon's pure - heartedness, their relationship can be very complex in fanfics, often blurring the lines between friendship, rivalry, and something more.
One common theme is danger. Hisoka is a very dangerous character, and in these fanfics, the reader often finds themselves in precarious situations because of him. For example, they might be caught up in his battles or his schemes.
One common theme is the clash of personalities. Toshiro's seriousness against Hisoka's eccentricity.
Many 'gon x hisoka fanfic' also have the theme of redemption. Hisoka is a rather morally ambiguous character. Fanfics may explore if and how he can be redeemed through his relationship with Gon. It adds depth to the story and makes for a more complex and thought - provoking read.
Another theme is power. Given that both are very powerful in their own ways, fanfics often deal with how they compare their powers, use their powers in relation to each other, or how their powers influence their relationship.
One common theme is the exploration of their contrasting personalities. Kurapika is often depicted as serious and goal - oriented, while Hisoka is more unpredictable and pleasure - seeking. Their interactions based on these differences are a big part of many fanfics.
The theme of loyalty also pops up. In some fanfics, they test each other's loyalty in various situations. It could be in the face of danger or when their own self - interests are at stake. This adds an interesting layer to their relationship as they navigate through these challenges together.
In 'killua x gon fanfic', the theme of sacrifice often appears. Killua or Gon might sacrifice something for the other's well - being. Another common theme is the power of their bond. It's often shown as something that can overcome great obstacles. And there's also the theme of shared dreams. They both have goals as hunters, and fanfics may explore how they pursue these dreams together or support each other in achieving them.