The characters from Big Hero 6 would have diverse interactions. Hiro, being the intelligent inventor, would start by asking a lot of questions to Joy and the others about how their system of controlling Riley works. Baymax would immediately notice if any of the emotions were feeling unwell, like if Sadness was overly sad, and would offer his support. Go Go would likely bond with Anger over their shared determination. Fred would probably try to get Fear to be more adventurous, which could be both good and bad. Wasabi would try to create a more organized environment for the emotions, as he is used to order in his own life and in the Big Hero 6 team's operations. All of these interactions would be a mix of learning, sharing, and sometimes butting heads as they all come from different worlds.
Hiro would likely be very curious about the emotions. He would try to study them and understand how they work. Baymax, on the other hand, would probably be very gentle and try to comfort any of the emotions that seem distressed, like Sadness. Go Go might be a bit impatient with the more timid emotions like Fear, but she would also respect their role. Fred would probably be excited to meet these new 'creatures' and want to be friends with all of them immediately. Wasabi would be a bit cautious at first, but then warm up to them.
The interaction between the characters would be full of surprises. Consider Baymax and Joy. Baymax is all about helping and healing, and Joy is about spreading positive feelings. They could team up to make people in San Fransokyo feel better, Baymax by providing physical care and Joy by influencing their emotions. Then there's Hiro and Anger. Hiro might initially be annoyed by Anger's brashness, but over time, he could learn to use that energy in his battles. The other characters like Fred and the other emotions would also have their own unique interactions. Fred might try to show off to the emotions with his monster knowledge, and the emotions would either be impressed or find it a bit silly depending on their nature.
Naruto would probably be very excited to meet the Big Hero 6 crew. He'd be eager to learn about their technology. Hiro might be a bit intimidated by Naruto at first but would soon realize they could be great friends. GoGo would be interested in Naruto's speed and agility, and might challenge him to a race. Baymax would be very curious about Naruto's body functions, especially related to chakra. Sakura could bond with Honey Lemon over their shared interest in science, although Sakura's knowledge is more in the medical - ninja field.
Perhaps there's a glitch in Baymax's system that causes him to project Riley's emotions as holograms. Hiro is confused at first but then realizes that these emotions are from someone else. They track the source of the connection and end up in Riley's mind. There, they find that the emotions are in chaos because of the sudden link to Baymax. The Big Hero 6 characters use their skills to help the Inside Out characters restore order. Hiro and Baymax help Joy understand how to better manage the positive emotions while the rest of the team helps the other emotions like Sadness not feel so left out or misunderstood.
In a 'Big Hero 6' and 'Inside Out' crossover fanfiction, perhaps Riley visits San Fransokyo. During her visit, she witnesses an accident that Big Hero 6 is responding to. The chaos and destruction make Sadness start to surface strongly in her. Baymax senses her distress and tries to help her. This leads to the team inviting Riley to their lab to cheer her up. Inside their lab, the emotions are fascinated by all the high - tech gadgets and start interacting with them, causing some comical and unexpected situations as they blend the two very different worlds of technology and emotions.
The characters would likely have a mix of admiration and friendly rivalry. For example, the cool and collected protagonist of Persona 5 might be intrigued by the more laid - back nature of the Persona 4 protagonist. Meanwhile, the Persona 3 protagonist, with his more somber and serious demeanor, could initially seem a bit intimidating to the others. But as they get to know each other, they would start to bond over their shared experiences of fighting Shadows and protecting their worlds.
The 1987 Turtles would probably be very curious about the more serious and intense 2003 Turtles. They might crack jokes at first to ease the tension, while the 2003 Turtles could be a bit annoyed by their silliness. But as they face challenges together, they'd start to respect each other. For example, when fighting Foot Soldiers, the 1987 Turtles' acrobatic and fun - loving fighting style could complement the 2003 Turtles' more strategic and brutal combat.
The heroes in My Hero Academia would be in awe of Spider - Man's abilities. His ability to climb walls and swing from buildings would be something new to them. They might try to incorporate some of his moves into their own fighting styles. Midoriya would look up to Spider - Man as another symbol of hope, just like All Might.
In a crossover, the RWBY characters would have to adapt to Doflamingo's powers. Yang's hot - tempered nature might lead her to engage in a direct fight with Doflamingo, which could be both dangerous and exciting. Weiss would use her intelligence and her family's resources to try to find a weakness in Doflamingo. Ruby, with her innocent yet determined personality, would try to find a way to redeem Doflamingo if possible, but if not, she'd be fully committed to taking him down.
The Naruto characters are used to a world of ninjastic and chakra - based powers. When they meet the Claymore characters, who have a different set of powers based on their yoma - human nature, there would be initial confusion. For example, Naruto might be very curious about the Claymore swords and how they are used. The Claymore characters, like Clare, would be cautious about Naruto's exuberant personality and his powerful chakra. But eventually, they could learn from each other. Naruto could teach them about teamwork in a different way than they are used to in the Claymore world, and the Claymores could show Naruto how to be more stealthy and precise like they are when hunting yoma.
Sasuke from Naruto might initially be distrustful of Lucifer. He's used to dealing with his own world's threats and Lucifer's devilish appearance and powers would make him cautious. But if they find a common goal, like protecting someone or something, Sasuke could grudgingly work with him. Naruto, on the other hand, would be more open - minded and try to befriend Lucifer right away.