I think Iron Man and C - 3PO would make a great pairing. Iron Man could upgrade C - 3PO's systems, and C - 3PO could provide Iron Man with valuable information about different cultures and languages in the Star Wars universe. They're both tech - savvy characters, and their interactions would be full of witty banter.
Thor and Chewbacca would be a hilarious and powerful pairing. Thor's godly strength and Chewbacca's brute force would make them a force to be reckoned with. Thor could also share his knowledge of magic with Chewbacca, while Chewbacca could teach Thor a thing or two about loyalty and friendship within a group like the Rebels or the Avengers.
Black Widow and Ahsoka Tano would be an amazing pair. They are both strong female characters with great combat skills. Black Widow could learn some lightsaber combat from Ahsoka, and Ahsoka could pick up some stealth and espionage techniques from Black Widow. They could go on secret missions together in a crossover story.
Another good pairing could be Jacob and Thor. Jacob's shape - shifting ability and his connection to nature could be something that Thor respects. They could bond over their physical strength and their loyalty to their respective groups. And Thor could introduce Jacob to the world of Asgardian magic and technology.
Another good pairing could be Spartan Locke and Black Widow. Locke is a skilled and stealthy Spartan, and Black Widow is a master spy. They could work together on covert missions, sharing their skills in combat and infiltration. For example, Locke could provide the muscle and high - tech support while Black Widow uses her espionage skills to gather intelligence.
I think Rey from the Jedi Knight side could be paired well with Scarlet Witch. Rey is still learning about her powers, and Scarlet Witch has very powerful and sometimes uncontrollable abilities. They could bond over their experiences with power and how to use it for good. Also, Obi - Wan Kenobi and Iron Man. Obi - Wan's wisdom and calm demeanor could contrast with Iron Man's brash and innovative personality. They could work together to solve a technological - magical problem that arises in the crossover.
I think Eren and Spider - Man could make a great pairing. Eren has his determination and the power of the Titans, and Spider - Man has his agility and quick thinking. They could learn a lot from each other in terms of fighting skills and moral values.
I think Thor and Chewbacca would be a really fun pairing. Thor with his god - like powers and hammer, and Chewbacca with his brute strength and loyalty. They could have some really comical moments together, like Thor trying to understand Chewbacca's growls and Chewbacca being in awe of Thor's lightning.
The Emperor Palpatine and the God - Emperor of Mankind. Both are extremely powerful and have a far - reaching influence over their respective universes. A crossover between them could explore themes of ultimate power, tyranny, and the price of maintaining control over vast empires.
A rather unexpected but potentially great pairing could be Ashley Williams and Vala Mal Doran. Ashley is a tough and no - nonsense soldier in Mass Effect, and Vala is a wily and resourceful adventurer in Stargate. They could get into all sorts of scrapes together and use their different skills to get out of them. On the other hand, Kaidan Alenko and Jonas Quinn could be paired. Kaidan has biotic powers in Mass Effect, and Jonas has his own unique abilities in Stargate. They could explore how their powers might interact or complement each other in different situations.
Happy from Fairy Tail and Jigglypuff would be an interesting pairing. Happy loves fish and Jigglypuff loves to sing. They could have a comical relationship where Jigglypuff's singing puts everyone to sleep except Happy, who just enjoys the performance. And in times of trouble, Happy could fly Jigglypuff around to safety or to strategic positions in a fight.
One great pairing could be Celty and Uta. Celty is a headless rider with a lot of mystery around her, and Uta is a ghoul with a deep love for art and his own brand of mystery. They could share their knowledge of the underground and the strange things they've seen. Another interesting pair would be Shizuo and Ayato. Shizuo's strength and short - temper against Ayato's rebellious and somewhat violent ghoul nature would lead to some intense confrontations. And finally, Izaya and Nishiki could be paired. Izaya loves to play with people's minds, and Nishiki has his own complex relationship with his ghoul identity and his past actions. Izaya could really mess with Nishiki's head in the crossover.
Iron Man and Ethan Hunt would be an amazing pairing. Iron Man with his high - tech suit and Hunt with his resourcefulness. They could share their knowledge of gadgets and come up with some really cool strategies to defeat the enemy. Another great pairing could be Black Widow and Ilsa Faust. Both are strong female characters with great combat skills and espionage experience. They could work together undercover and take down the bad guys from the inside.