Sasuke and Magneto. Both are complex characters with a bit of a dark side. They could either become enemies as their goals might clash. Sasuke is on a journey to gain power for revenge, and Magneto wants to protect mutants but sometimes uses extreme methods. Or they could form an unlikely alliance, learning from each other's determination and power - seeking motives.
Kakashi and Professor X. They are both wise leaders in their respective universes. Professor X could be interested in Kakashi's sharingan and its abilities. Kakashi could learn from Professor X about how to better handle and understand different types of people and powers. They might work together to train the younger characters in both universes to be better at using their powers and skills.
Probably Wolverine and Spiderman. Wolverine is often on the front lines in X - Men stories, and his no - nonsense attitude would contrast well with Spiderman's quippy nature. They might meet when investigating a strange occurrence in New York that involves both mutants and non - mutants.
Naruto and Dawn are the obvious ones. Since it's a 'naruto x dawn pokemon fanfiction', they would likely be at the center of the interactions. They could start off as strangers and gradually learn about each other's worlds.
Naruto and Rey would be likely to interact. Naruto's positive and determined nature would complement Rey's own strong will. They could exchange knowledge about their respective powers, with Naruto showing Rey how to control her chakra (if she had it) and Rey teaching Naruto about the Force.
Naruto and Hiro are likely to interact. Naruto's enthusiasm and Hiro's intelligence would create an interesting dynamic. They could both inspire each other in different ways, like Naruto inspiring Hiro to be more bold and Hiro teaching Naruto about science and technology.
Definitely Wolverine and Deadpool. They have a lot in common, like their regenerative abilities and their combat skills. Their interactions could be really interesting, with Wolverine being all serious and Deadpool cracking jokes all the time.
If we consider characters like Sasuke from Naruto and Cyclops from X - Men. Sasuke, with his brooding and often self - centered nature, might initially clash with Cyclops, who is a natural leader. However, as they face common enemies, they would start to understand each other's motives. Naruto would be like the bridge between the two groups, trying to get everyone to work together. He would befriend characters like Kitty Pryde, and they would share their different combat experiences.
Dumbledore could be another character. He is extremely powerful and wise. He might have some prior knowledge or intuition about Alduin's existence. He could interact with Alduin in a more diplomatic way, trying to understand Alduin's motives and perhaps find a way to co - exist peacefully if possible. Or, if Alduin proves to be a threat, Dumbledore would be one of the few who could stand up to him.
I think Ron Weasley would be one of the characters likely to interact. He's always up for an adventure, and the wildness of Neverland would appeal to him. Ginny Weasley could also be involved. She's brave and strong - willed. From Peter Pan's side, Tinker Bell might interact with the Hogwarts students. She's feisty and would be curious about these new arrivals with different kinds of magic. And of course, the Lost Boys would be eager to meet the wizards and witches from Hogwarts.
Sasuke could also have an interesting interaction with one of the goddesses. Given Sasuke's complex personality and his search for power, a goddess might try to guide him in a different direction. Maybe a goddess could show him that there are other ways to gain strength aside from his usual methods, and Sasuke could in turn show the goddess the depth of human emotions and the consequences of a troubled past.
Definitely Harry Potter and Optimus Prime. Harry is the hero in the wizarding world, and Optimus is the leader of the Autobots. They both have a strong sense of justice and would likely team up to face big threats. Another pair could be Hermione and Bumblebee. Hermione's intelligence could be used to understand the Transformers' technology, and Bumblebee's friendly nature would make them get along well.