Thor and Grover would be a hilarious pair. Grover, with his love for nature and his goat - like features, would be so different from the god of thunder. But Thor could learn a thing or two about the Earth's natural magic from Grover, and Grover would be in awe of Thor's strength and his mighty hammer.
I think Annabeth and Black Widow would be an interesting pair. Both are strong, intelligent women. Annabeth's strategic mind from her demigod training could work well with Black Widow's spy skills. They could be on a mission to infiltrate a secret lair that has something to do with both the Greek and Marvel worlds.
Definitely Thor and Percy. Thor has his powerful hammer and lightning powers, while Percy can control water. They could have an epic battle against a fire - based enemy, with Thor's lightning and Percy's water creating steam and all kinds of cool battle effects.
Percy Jackson and Mal would be an interesting pair. Percy has his water powers and his heroic, yet sometimes impulsive nature. Mal has her magic and her complex background as a VK. They could learn a lot from each other. Percy could show Mal that not all heroes are born into perfect situations, and Mal could introduce Percy to the different kinds of magic in the Descendants world.
Grover and Sam would be a fun combination. Grover is kind of goofy and has his own unique charm, and Sam is tough and not easily intimidated. They could get into all sorts of comical situations together, like when they go on a hunt for a mythical creature that has escaped into the city where iCarly is set.
Jason Grace and MG would also be an exciting pairing. Jason has his abilities as a son of Jupiter, his control over lightning and his Roman military training. MG is a vampire in Legacies. They could form an unlikely alliance. Jason could teach MG about discipline and honor from the Roman point of view, while MG could show Jason the unique aspects of being a vampire, like enhanced senses and the ability to move quickly. They could team up to protect their friends from threats that target both the demigod and vampire communities.
Definitely Percy and Dean. Percy has his quick - thinking and his water powers from being a son of Poseidon, while Dean is the tough, street - smart hunter. Their different personalities and skills would create an interesting dynamic. They could learn from each other, like Percy teaching Dean about Greek mythology and Dean showing Percy some of his hunting tricks.
Hermione Granger and Annabeth Chase would be an amazing pair. Hermione is super - intelligent, book - smart, and loves to study magic. Annabeth is a strategist, with a vast knowledge of Greek mythology. They could share their knowledge, Hermione teaching Annabeth about wizarding spells and Annabeth introducing Hermione to the lore of the Greek gods. They could also work together to solve complex problems that require both magical knowledge and knowledge of mythology.
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.
One interesting pairing could be Godzilla and Hulk. Both are powerful, almost indestructible forces of nature. They could have an epic battle at first, as they both have a tendency to lash out when provoked. But then they could end up teaming up against a greater threat, like a powerful alien invasion. Another great pairing would be Godzilla and Iron Man. Iron Man could use his technology to study Godzilla, and perhaps even try to create some sort of armor inspired by Godzilla's abilities. And Godzilla could provide a physical presence that Iron Man could rely on in a fight. Also, Godzilla and Thor could be a fascinating pair. Thor's god - like powers and connection to nature could be paralleled with Godzilla's own primordial power. They might have a mutual respect for each other's strength.
Thor and a Dwarf Lord would be really interesting. Thor with his god - like powers and his hammer Mjolnir could team up with a Dwarf Lord, who is known for his skill in forging and combat. They could exchange stories about their great battles and also work together to create some powerful weapon, perhaps using Asgardian and Dwarven forging techniques.
I think Percy and Sans would be really interesting. Percy has his water powers and combat skills, while Sans has his teleportation and bone - attacking abilities. Their personalities are also quite different. Percy is more of a heroic, go - get - it type, while Sans is laid - back but extremely powerful. It would be cool to see how they interact and how they could fight together against a common enemy.