A great Monster Hunter World crossover fanfiction idea is a crossover with Pokémon. Imagine the hunters in the Pokémon world, using their skills to catch Pokémon in a more 'hunting' style rather than the traditional Pokémon-catching method. They could also use Pokémon as companions in their monster hunts in the Monster Hunter World. Another interesting one could be a crossover with God of War. Kratos could join the hunters in their quests, bringing his brute strength and combat skills to the table.
One idea could be that Naruto characters are transported to the Monster Hunter world. For example, Naruto himself could use his shadow clone jutsu to hunt down large monsters. It would be really cool to see Sasuke using his Sharingan to analyze the monsters' weak points. Another idea is to have the Monster Hunter weapons and armors be integrated into the Naruto universe. Maybe some ninja could start using the powerful long swords or bows from Monster Hunter in their battles.
Maybe the monsters from the Monster Hunter world start appearing in Remnant, the RWBY world. The RWBY teams then have to adapt their fighting styles to take on these new and powerful foes. They might study Monster Hunter strategies to gain an edge.
Perhaps the Handler has a hidden past related to a powerful group in the Monster Hunter world. When this past starts to catch up with her, the Hunter has to protect her. They end up uncovering a conspiracy that shakes the very foundation of the Hunter's Guild. Along the way, their feelings for each other grow and they face many challenges together.
One idea could be a crossover with Naruto. Gon and Naruto could team up and learn from each other's unique ninja and hunter skills. They might compete in a friendly way to see who's stronger in different aspects like physical strength or strategy.
One idea could be to have the hunters from Monster Hunter enter the world of Dragon Age. They could encounter the different races like elves and dwarves, and perhaps help them in their fight against darkspawn. The hunters' skills in taking down large and dangerous monsters could be a great asset in the battles of Dragon Age.
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 a story about a novice hunter who befriends a rare monster instead of hunting it. They form an unlikely bond and together they face other threats in the world. This would add an interesting twist to the typical hunting theme.
A plot could revolve around a monster girl who is trying to prove herself in the world of Monster Hunter. She befriends a human hunter, and together they face various challenges in the wild, like uncovering ancient secrets that are tied to both monster and human history. This could involve exploring forgotten ruins and deciphering old texts.
Another possibility is a crossover with the Percy Jackson series. Since both deal with different mythologies, the Shadow Hunters and the demigods could meet. They could exchange knowledge about their respective mythologies and perhaps work together to defeat a new kind of monster that is emerging due to a mix of their two worlds' magic.
One idea could be to have the Fairy Tail mages team up with Monster Hunter characters to take on a powerful and mysterious new monster that is causing chaos in both worlds. They could combine their magic and hunting skills in unique ways.