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.
A cool plot for the crossover fanfiction could be that a new villain emerges who has the power to manipulate both technology and emotions. This villain targets San Fransokyo and Riley's mind. Big Hero 6 teams up with the emotions inside Riley's head to fight this common enemy. Hiro and his friends use their technological skills, while the emotions provide their unique understanding of human behavior and motivation. For example, Anger could give them the extra push to be more aggressive in their fight, while Joy could keep their spirits high during difficult times.
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.
A great plot could be that there is a threat that is causing chaos in both the Naruto world and the Big Hero 6 world simultaneously. The two groups meet while investigating the source of this threat. Naruto, with his determination and strong will, would inspire Hiro to be more confident in himself. They could combine their unique abilities. For example, Naruto could use his shadow clone jutsu to help Big Hero 6 in a large - scale battle, while the technology of Big Hero 6, like Fred's suit, could be used to give Naruto an edge against certain enemies in his own world.
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.
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.
It could be really exciting. Maybe the Avengers could visit San Fransokyo and be amazed by the high - tech there. Hiro could show them Baymax and they might collaborate to fight a new super - villain that threatens both their worlds.
One possible plot could be that the Big Three - Mirio, Nejire, and Tamaki - are transported to an alternate universe where they have to team up with their counterparts from different versions of BNHA. They face new villains and challenges that require them to combine their unique quirks in unexpected ways. For example, they might encounter a villain who can manipulate time, and they have to figure out how to use Mirio's intangibility, Nejire's wave motion, and Tamaki's transformation quirks to stop the villain before he destroys the fabric of the universes.
A cool Big Hero 6 crossover fanfiction idea might involve crossing over with the DC Universe. Hiro could meet Batman and learn about his detective skills and use of gadgets. Baymax could interact with Superman, which would be an interesting contrast of a big, strong hero and a soft, caring robot. Or perhaps a crossover with the Powerpuff Girls. The girls' superpowers combined with the tech - savvy of Big Hero 6 could lead to some really fun and action - packed adventures.
Maybe the plot involves a device created by Stark Industries that malfunctions and creates a portal between the two universes. The heroes from both sides initially have some misunderstandings and fight each other. But then they realize that there is a greater threat. The My Hero Academia students could learn a lot from the Avengers' teamwork and fighting styles, while the Avengers are impressed by the creativity of the quirks. They then join forces to stop a group of villains who are trying to use the portal to invade both worlds.
One idea could be that the Pokemon have Quirks. For example, Pikachu could have an electric - based Quirk that is even more powerful than its normal electric attacks. The heroes in training from My Hero Academia could team up with these special Pokemon to fight against villains who are also using Pokemon with dangerous Quirks. It would be a really cool mix of the two universes.
In such a crossover fanfiction, the Big Hero 6 gang could end up in a situation where they have to protect a group of survivors from The Walking Dead. Hiro could reprogram Baymax to be more combat - ready against the walkers. Honey Lemon's chemical - creating abilities could be used to make substances that either repel the walkers or attract them to a certain area for easier elimination. They would also have to deal with the moral and ethical dilemmas that the characters in The Walking Dead often face, like deciding who to save and who not to, which would add more depth to their characters.