Doctor Strange and Ajak. Doctor Strange is well - versed in the mystic arts and Ajak has a lot of knowledge about the Eternals' history and their connection to the Celestials. Their knowledge areas could intersect, and they would likely be the first to start sharing information. Maybe Strange senses some strange energy related to the Eternals and approaches Ajak to find out more.
Death from DarkSiders and Black Widow could have an interesting interaction. Death has seen countless deaths and has a very different perspective on life and death compared to the human Black Widow. Their conversations could be deep and thought - provoking as they work together on a mission.
Probably Ash and Iron Man. Iron Man is always curious about new things and Ash with his Pokémon would be quite an interesting sight for him. He'd likely approach Ash first to ask questions about what he is and what those strange creatures are.
It could be Percy and Black Widow. Natasha is a master of reading people, and she'd notice Percy right away. She might approach him in a more stealthy way compared to the others, trying to assess if he's a threat or an ally. And Percy, being used to danger, would be on his guard at first, but then start to trust her as she shows her good intentions.
I think Quinn and Black Widow would be an interesting pair. Quinn is used to being in a position of power and popularity in the Glee club, and Black Widow is a strong female character in the Avengers. They could have some really cool exchanges about strength and femininity.
The Avengers and the Eternals could interact in a variety of ways. The Hulk might be intrigued by Gilgamesh's strength. Black Widow could try to figure out the Eternals' motives. And on the Eternals' side, Sersi might befriend Scarlet Witch and learn about her magic. There could also be some friendly competitions between the two groups, like a race between Quicksilver and Makkari.
Well, it could be Twilight Sparkle and Spongebob. Twilight is the intelligent and studious one in My Little Pony. She would be intrigued by Spongebob, who is clearly a very different kind of creature from Equestria. Spongebob, on the other hand, would be in awe of Twilight's magic and knowledge. Their first meeting might happen when Spongebob is exploring the library in Ponyville that Twilight often frequents. She would start asking him questions about where he came from and what his world is like.
Probably Percy Jackson from 'Heroes of Olympus' and Magnus Chase. Percy is like the main hero in his series and Magnus is the main character in his. It makes sense that they would be the first to cross paths, maybe because of some strange magical event that throws them together.
I think it would be Spider - Man. Since he's also relatively young and has a sense of humor. He would be able to relate to Robin on a more personal level compared to the other Avengers. They could start chatting about their cool gadgets and how to use them in different situations.
Hulk might be an interesting one too. Sonic's speed could either annoy or amuse Hulk. If they end up on the same side, Sonic could use his speed to lead Hulk towards the enemies. And Hulk's raw strength could be something Sonic would be in awe of. They could have a really unique dynamic, like a fast - moving pest annoying a big, strong giant at first, but then they become an effective team.
I think Tony Stark and Damon Salvatore would be very likely to interact. Tony with his high - tech gadgets and Damon with his vampire charm and quick - witted nature. They could have some really interesting banter, like trading sarcastic remarks while trying to solve a common problem.