In my opinion, the Joker and Loki would be a very interesting duo to focus on. They are both chaotic and love to cause trouble. Their schemes and mind games could create a lot of chaos in both Gotham and the Avengers' world. Also, Robin (whichever version) and Spider - Man could be fun. They are both young heroes with a lot of energy and a sense of humor. Their interactions could bring some light - heartedness to the otherwise dark and serious crossover.
Batman and Black Widow would be really interesting. Batman is all about mystery and detective work in the shadows, while Black Widow is a master spy. They could learn a lot from each other's skills in stealth and intelligence gathering. Also, Thor and Batman could be a great focus. Thor with his god - like powers and Batman with his human ingenuity. Imagine Batman trying to figure out the science behind Thor's hammer while Thor is amused by Batman's determination in the face of the supernatural.
Hulk would be an interesting character to focus on. Imagine the dynamic between him and Wolverine. They both have superhuman strength and a bit of a wild side. Their fight could be epic, but then they could also form an unlikely alliance. Also, Black Widow could add an element of mystery and stealth to the story. Her skills in espionage and combat could be useful in a plot where the team is trying to uncover a secret conspiracy related to Wolverine's past.
Definitely Captain America and Agent Coulson. Captain America represents the old - school heroism of the Avengers and Coulson is the heart and soul of Agents of Shield. Their different leadership styles and moral compasses would create a great dynamic. They could learn from each other, like Coulson teaching Cap about modern technology and Cap teaching Coulson about the values of the past.
Batman would be the most interesting. He doesn't have superpowers like the Avengers, but he's still a formidable hero. His presence in their world would be like a wild card. He'd be constantly analyzing the Avengers and their enemies, and his dark, brooding nature would contrast with the more flashy and super - powered Avengers.
I think Daisy Johnson would be really interesting. She has her unique powers and a complex backstory from her time in SHIELD. In a crossover, she could interact with the likes of Thor. Maybe she could learn some new ways to control her powers from him, as he has experience with his own godly powers. And she could also show the Avengers her skills in combat and stealth that she learned in SHIELD. It would be fascinating to see how she holds her own among the super - powerful Avengers.
Definitely Ben and Ash. Ben with his Omnitrix and ability to transform into different aliens brings a whole new dimension of power and adventure. Ash, on the other hand, has his experience and deep connection with Pokemon. Their interactions would be fascinating. For instance, Ben might be amazed at how Ash can communicate with his Pokemon without any high - tech device, and Ash could be in awe of Ben's alien forms and their powers.
Definitely Naruto and Geralt. Naruto with his bright - eyed optimism and powerful ninja skills would contrast greatly with Geralt's brooding and more practical monster - hunting skills. Their interactions would be full of learning and cultural clashes. For example, Naruto might be shocked at how Geralt deals with certain 'monsters' that in Naruto's world could potentially be redeemed. And Geralt would be intrigued by Naruto's chakra and jutsu.
Definitely Naruto and Link. Naruto's energetic and determined personality would contrast well with Link's more stoic nature. They could learn a lot from each other. Also, Zelda would be interesting. Her wisdom and magical abilities would add a different dimension. And Sasuke could also be a great character to include. His dark past and thirst for power could lead to some interesting interactions in the Zelda world, especially when faced with the power of the Triforce.
Definitely Naruto and the main Guyver character. Naruto because of his determination and growth throughout the Naruto series. He would be really interesting to see how he adapts to the Guyver's powers. And the Guyver, because its powers are so unique and different from the ninja abilities in Naruto. Their interactions could be full of misunderstandings at first as they come from different worlds, but then they could learn from each other.
Vilgax from Ben 10 could be an interesting character to include. If he somehow gets his hands on a Green Lantern ring or the technology related to it, he could become an even more formidable foe. This would force Ben and the Green Lanterns to team up against a common enemy who has combined the power of both universes in a dangerous way.
The Flash (Barry Allen) could also be a great character to include. Since he has crossovers with both Arrow and Supergirl in the actual shows. His light - hearted nature and super - speed abilities could add a different dynamic to the story. He could act as a mediator between Oliver and Kara when they have differences. Also, villains like Lex Luthor could be really interesting to explore in this crossover. His brilliant mind and devious plans could pose a significant threat to both heroes and force them to work together in new ways.