Black Widow and Kong could be a great pair in a crossover fanfiction. Black Widow's skills in espionage and combat could be used in a different way when dealing with Kong. Maybe she has to infiltrate an area where Kong is held captive or find a way to communicate with him. Her agility and intelligence would contrast well with Kong's raw power.
Thor and Godzilla would be an interesting pair. Thor, with his god - like powers and his hammer Mjolnir, could potentially have a showdown with Godzilla. It would be a clash of different kinds of power - Thor's lightning and brute strength against Godzilla's atomic breath and massive size.
Doctor Strange and Ghidorah would be an intense pairing. Doctor Strange, with his mastery of the mystic arts, would face a huge challenge against the three - headed monster Ghidorah. He would have to use all his spells and knowledge to try and stop Ghidorah from causing chaos in both the Monsterverse and MCU universes. The battle would be a spectacular display of magic against brute, otherworldly force.
Black Widow and Monarch scientists would be an interesting pair. Black Widow is used to dealing with espionage and sneaking around. The Monarch scientists have in - depth knowledge about the Titans. She could help them in a more tactical way, like getting information from shady organizations that might be trying to use the Titans for their own gain. And the scientists could provide her with valuable information about the kaiju to help the Avengers in their fight.
In a MCU Monsterverse crossover fanfiction, perhaps the Infinity Stones could be involved. Let's say the Time Stone gets lost and ends up in the Monsterverse. Doctor Strange and some of the other Avengers follow it. There they find that the Titans are somehow connected to the power of the Infinity Stones. They need to work with the Titans to retrieve the Time Stone. Godzilla, being a powerful force of nature, could be the key to accessing the area where the Time Stone is hidden.
Darth Vader would be an amazing character to include. His imposing presence and incredible power would be a huge threat in the MCU. He could face off against Thor, with their different types of powers creating an epic battle. Another interesting character would be Kylo Ren. His conflicted nature could add an interesting dynamic, especially if he interacted with characters like Captain America who have strong moral compasses.
Definitely Miles Morales. His different origin story and unique powers compared to MCU's Spider - Man would make for some great interactions. He could show Peter Parker from the MCU new ways to use his spider - powers.
A Monsterverse MCU crossover fanfiction could involve the Titans from Monsterverse invading the MCU universe. For example, Godzilla could emerge in New York City, much like the Chitauri invasion in the first Avengers movie. The Avengers would then have to figure out how to deal with this colossal, irradiated beast. Maybe Iron Man tries to use his repulsor rays against Godzilla, but they have little effect.
Sherlock and Italy would be an interesting pair. Italy is often portrayed as a bit scatter - brained and carefree in Hetalia, which would contrast sharply with Sherlock's intense and focused nature. Their interactions could be both comical and lead to some interesting plot developments as Sherlock tries to get Italy to focus on the case at hand. Another interesting pair could be Sherlock and Germany. Germany's discipline and order could either clash or complement Sherlock's methods, and they could have a great dynamic when it comes to solving a mystery together.
Mulan and the twins from 'Twitches'. Mulan is a brave and resourceful warrior. The twins have their own unique magical abilities. They could team up in a battle against an evil force that is threatening both their worlds. Mulan could teach the twins some combat skills, and the twins could use their magic to give Mulan an edge in battle, like creating magical distractions or enhancing her weapons.
Inuyasha and Ariel would be an interesting pair. Inuyasha is a rough - around - the - edges half - demon, while Ariel is a curious and adventurous mermaid. Ariel could be fascinated by Inuyasha's otherworldly appearance and his sword, and Inuyasha might be intrigued by Ariel's ability to swim and communicate with sea creatures. They could team up to face a threat that endangers both the sea in the Disney world and Inuyasha's forest in his world.
I think Naruto and Lucifer would be an interesting pair. Naruto's unwavering belief in good and his never - give - up attitude would contrast sharply with Lucifer's more cynical and self - centered nature. Their interactions could be full of tension and also moments of mutual understanding as they learn from each other.
Hellboy and Wolverine would be a really interesting pair. Wolverine's feral nature and regenerative abilities combined with Hellboy's brute strength and demonic heritage would make for some great action scenes. They could have some really cool banter too, with Wolverine's gruff attitude and Hellboy's dry sense of humor.