I think Midoriya could be his best friend. Midoriya is kind - hearted and always looking to learn, which would appeal to Killua. They could bond over their shared desire to become stronger and protect others.
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.
The moment when a veteran player retired after a long and successful career is also a great one. There was a standing ovation, and players from all over the world paid tribute to his contribution to the sport.
One great Gon x Killua x Hisoka fanfiction is 'Unlikely Alliances'. It explores their complex relationships in a unique adventure setting. The story does a wonderful job of showing how Gon's pure heart, Killua's loyalty, and Hisoka's unpredictability interact in different situations.
One of the best batfamily moments in fanfic is when they all come together for a family dinner. It shows their different personalities interacting in a normal, non - crime - fighting setting. Dick is cracking jokes, Jason is brooding but still participating, Tim is being the smart one with some tech talk, and Damian is reluctantly joining in. It gives a sense of family and normalcy that is often lacking in their vigilante lives.
Another great mom moment in stories can be when a mom is a source of inspiration. In the story of Malala Yousafzai, her mother supported her education and her fight for girls' rights. This kind of mom encourages their children to be brave and strive for what they believe in. So that's a really powerful mom moment in a real - life - inspired story.
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.