The plot might involve Naruto's unique abilities like shadow clones and Rasengan being combined with Nen abilities in the Hunter x Hunter world. For example, he could use his chakra to enhance his Nen attacks if he manages to learn Nen. And they could all be on a quest to find a way to get Naruto back to his own world while also dealing with some powerful villains who are interested in Naruto's power.
The characters' different power systems would also play a role in their interactions. Naruto might be curious about Nen and ask a lot of questions. Gon and Killua would be amazed by Naruto's chakra - based powers. They could also learn from each other. For instance, Naruto could teach Gon and Killua about his ninja training techniques, like stealth and quick - thinking in combat situations. And Gon and Killua could show Naruto how to better utilize his senses in battle, which is something they're good at in the Hunter x Hunter world.
One possible plot could be that Killua decides to surprise Gon with breakfast in bed. He gets up early, sneaks into the kitchen, and tries to cook Gon's favorite meal. However, he's not very good at cooking, so there are a lot of comical mishaps. In the end, Gon wakes up to a messy kitchen but a very sweet gesture from Killua.
One idea could be that Naruto and Gon meet during a strange interdimensional rift. They initially misunderstand each other but soon realize they have a common goal of protecting their friends and worlds. Another could be that the Akatsuki and the Phantom Troupe somehow cross paths and form an uneasy alliance to achieve their own ends, which involves stealing powerful artifacts from both Naruto's world and the Hunter x Hunter world. And a third idea might be that Naruto and Killua swap places for a short time, experiencing the different power systems and cultures of each other's worlds.
The plot could center on the 13th chairman's efforts to bridge the gap between different hunter groups. There are often various types of hunters with different goals and methods. The chairman might try to unify them to work towards a common good, like protecting the world from a new, unknown danger.
Well, one way it could work is by having Naruto's chakra system somehow be translated into the nen system of Hunter x Hunter. Naruto's immortality could be related to some sort of nen ability he discovers in the Hunter x Hunter world. Maybe his god - like powers would make him a target for certain groups in the Hunter x Hunter universe, like the Phantom Troupe. They might see his power as a threat or something they can use for their own gain.
The unique power systems combination. For instance, when crossed with other anime like 'Dragon Ball', the Saiyan powers and 'hunter x hunter' nen powers can create some out - of - this - world fight scenarios that you won't find in the original works.
Maybe Naruto is transported to the Monster Hunter world and has to learn the ways of a Monster Hunter to survive.
The plot could be that the granddaughter has a special ability that the 13th chairman wants to utilize for the good of the Hunter community. So, he takes her under his wing to train her. As they train, they encounter various enemies who are after the granddaughter's power.
One common theme is the clash of powers. Since both Naruto and Hunter x Hunter have their own unique power systems, like Naruto's chakra and ninjutsu, and Hunter x Hunter's Nen, fanfictions often explore how these powers interact when the characters meet. For example, how would Naruto's Rasengan fare against a Nen - based attack.
The plot could also involve her having unique nen abilities different from Hisoka's. She might be on a journey to understand these powers and in the process, cross paths with the main characters from Hunter x Hunter. Perhaps she forms an unlikely alliance with Gon and Killua, who initially are wary of her because of her relation to Hisoka, but later come to respect her for her own qualities.