Some popular themes could be friendship. In many fanfictions, Gon and Fem Killua might have adventures together that strengthen their bond. Another theme could be self - discovery. As they face different challenges, they learn more about themselves. Also, there could be themes of family, especially considering Killua's complex family situation in the original story.
You can try fanfiction.net. It has a large collection of fanfictions related to various anime and manga, including ones about Gon and Fem Killua. Another option is Archive of Our Own (AO3). It has a wide range of fan - created content, and you can easily search for the specific Gon and Fem Killua fanfictions you're interested in.
One plot idea could be a story where they team up for a special mission in a new, mysterious land. They face unique challenges that test their friendship and skills. Another could be a time - travel story where they go back to important moments in their pasts and change small things that have big impacts on their relationship.
One popular 'female gon freecs fanfiction' story could be about her adventures in a new and unexplored area of the 'Hunter x Hunter' world. It might involve her making new friends and facing unique challenges.
For Killua, you could explore his fear of losing Female Gon more deeply. Maybe he has nightmares about it, which makes him train even harder to protect her. For Female Gon, you could develop her sense of femininity in a world of mostly male Hunters. She could start wearing more feminine Hunter gear but still be as tough as ever.
Gon in fanfiction can be very single - minded in his pursuit of goals, just like in the original. He might be a bit more naive at times, which can lead to interesting plot twists. Killua is often portrayed as having a complex emotional side. He struggles with his past as an assassin and his loyalty to Gon. His cool exterior may crack in some fanfictions, showing his true feelings.
One popular theme is their friendship. Their bond is very strong in the original work, and fanfics often expand on it, like how they rely on each other in dangerous situations. Another theme is adventure. Since they are both on a journey in the original story, fanfics may create new adventures for them, such as exploring uncharted lands.
One popular 'killua and gon fanfiction' is 'A New Adventure'. It takes the two characters on a journey to a mysterious island not shown in the original series. Another great one is 'Bond Strengthened', which focuses on how their friendship deepens during a difficult quest. There's also 'The Hidden Powers' that explores new abilities they might discover.
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.
Friendship is a very popular theme. Their strong bond as friends is often explored, like how they are always there for each other through thick and thin. For instance, in some fanfics, when one of them is in danger, the other will go to great lengths to save them.
There are many great 'Killua x Gon' fanfictions that focus on their friendship and adventures. For example, some stories might explore their further training together, delving into new techniques they learn and how they support each other in the face of stronger opponents. Another type could be about them traveling to new and mysterious lands within the 'Hunter x Hunter' universe, encountering unique creatures and cultures.