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.
Well, it could be about a person who had their heart broken (the old torn heart) and then found new love or a new sense of self which is like having a new heart. Maybe it's about the journey from a state of emotional pain and disillusionment to one of hope and renewal.
In 'heart vs head novels', the plot usually revolves around the internal struggle. Novels in this category might show how the heart - led decisions can lead to chaos or great joy. On the other hand, head - led decisions can seem cold but might be more practical. A character in such a novel could be a businessperson who has an opportunity to merge with a company. Their heart says it's a betrayal of their small - time roots, but their head sees the financial benefits.
There could be a protagonist who experiences the change from an old torn heart to a new heart. It might be an individual who has faced heartbreak and then meets someone new who helps them heal, like a love interest.
Jane Eyre is also a great example. Jane has strong emotions and a passionate heart, but she also uses her head. When she falls in love with Mr. Rochester, she has to think rationally about their relationship, especially when she discovers his dark secrets. She follows her heart in loving him, but her head tells her she can't stay with him in certain circumstances.
In a Naruto world fanfic, Killua would bring a whole new dynamic. He has a dark past as an assassin which could either make him a feared or respected figure. His family's training has made him physically and mentally tough. In battles, he could use his electricity - based attacks in creative ways against ninjas. But he would have to learn about things like jutsus and the ninja villages. Also, his relationship with Gon in the HxH world was important for his character development, and in the Naruto world, he might find a similar bond with a fellow shinobi, which could change his perspective on things.
Yes, there are likely some fanfictions out there with such a concept. Fanfiction writers often come up with creative crossovers. You can try searching on popular fanfiction websites like Archive of Our Own or Fanfiction.net.
One example could be 'Pride and Prejudice'. Elizabeth Bennet has to balance her initial prejudice (a more head - based reaction) against Mr. Darcy with her growing feelings (from the heart). Another is 'The Great Gatsby'. Gatsby's heart is full of love for Daisy, but his head is clouded by his obsession and the social differences between them.