One idea could be a story where Pokemon Hunter J has a change of heart. Maybe she encounters a particularly powerful and kind Pokemon that makes her question her ways. For example, she tries to capture a Latios, but it shows her kindness and she starts to hesitate.
Another plot could be set in a world where Pokemon Hunter J teams up with some trainers. They are forced to work together to stop a greater evil, like a group that wants to use captured Pokemon for bad experiments. She could learn about the bond between trainers and Pokemon during this time.
A third plot idea is a prequel. Explore her backstory, how she became a Pokemon hunter in the first place. Maybe she had a tough childhood that led her to believe that capturing Pokemon for profit was the only way to survive. This could show her as a more complex character.
A cool Pokemon Hunter J fanfic could focus on her facing off against a powerful trainer who is trying to stop her illegal activities. The battles between their Pokemon could be really intense, with the trainer using unique strategies. It could also show her slowly realizing that there might be more to life than just hunting Pokemon for profit.
One interesting plotline could be Ash and his friends trying to outwit Hunter J's devious plans to capture rare Pokémon. Maybe Hunter J sets a trap for Pikachu, and Ash has to use his wits and the bond with his Pokémon to rescue Pikachu.
A plot could involve a Pokemon trainer who gets transported to the Monster Hunter world and has to use their Pokemon to survive and adapt. They could team up with hunters, teaching them about Pokemon and learning about Monster Hunter tactics in return. Maybe their Pikachu could use its electricity to stun small monsters, while they learn to make better use of the environment like hunters do.
One possible plot could be that Hunter J targets Ash for some unknown reason. Maybe she sees his unique bond with his Pokémon as a threat or something she wants to possess. Ash, being his usual brave self, has to outwit her while also protecting his Pokémon friends from her devious plans.
One idea could be a story where Pokemon trainers are recruited to participate in a Monster Hunter style quest. They have to use their Pokemon's skills in a new and dangerous environment filled with the large and menacing monsters from Monster Hunter. For example, a Charizard could use its fire breath not just to battle other Pokemon but to fend off a Rathalos. Another idea is a crossover where a particular Pokemon has some sort of connection to a Monster Hunter creature, like Pikachu being able to communicate with a Felyne and they team up to solve a mystery in both their worlds.
One idea could be the main character being reborn as a Pikachu and having to navigate the world with its electric powers while making friends with other pokemon. Another could be being reborn as a Eevee and having the unique ability to evolve into any form at will, which causes both envy and admiration among other pokemon. Maybe the reborn pokemon has memories of being a human and uses that knowledge to outwit trainers and other threats.
A plot could revolve around Menchi's past. Maybe she has a hidden connection to a powerful group or a long - lost family member. This could lead to a story of self - discovery as she uncovers secrets from her past while still maintaining her role as a hunter and a food expert. She might have to face old enemies or make difficult choices regarding her new - found knowledge.
One idea could be the main character using gamer skills to quickly learn Nen abilities in unique ways. For example, they might have a leveling system for their Nen types, which gives them an edge in battles against other Hunters or enemies.
A possible plot for 'Kaito Hunter x Hunter fanfiction' is that Kaito enters a special tournament in the Hunter x Hunter world. This tournament has rules and challenges that are different from the normal ones. He meets new and interesting characters during the tournament, some of whom become his friends and some his enemies. As he progresses through the tournament, he uncovers a conspiracy that is related to the very foundation of the Hunter x Hunter world. He then has to decide whether to expose it and risk his life or keep quiet and let the conspiracy continue.
Another plot could involve a character from the real world being transported into the Hunter x Hunter universe and having to quickly adapt to the system. They could start as a weak novice but then use their knowledge from the real world to find unique ways to level up and become a powerful Hunter. For example, they might use modern strategic thinking in battles or in exploring the complex world of Hunters.