To develop Naruto in a crossover with Obito, you can put him in situations where he has to use his wits against Obito's Sharingan - related abilities. This would force him to become more strategic. Also, Naruto could learn about the Uchiha clan's history from Obito, which would expand his knowledge. As for Obito, Naruto's presence could make him confront the fact that his actions have consequences. He could start to see the value in the bonds that Naruto has with his friends and village, and this could lead to a change in his goals and values.
A fanfiction story could start with Naruto being in a desperate situation where he feels that the normal path to peace is not working. So, he decides to team up with Obito and Madara. At first, they seem to be working towards a common goal. But then, Naruto realizes that their means are too extreme. For example, he discovers that the Infinite Tsukuyomi they plan would take away people's free will. He then has to find a way to stop them while still maintaining some sort of alliance. This could lead to a complex web of relationships and power struggles within the group.
For Naruto characters in a Zelda - inspired world, they could adapt their skills. Naruto might learn to use the Master Sword, and his rasengan could be modified to work with the magical elements of Zelda. Sasuke could use his sharingan to detect hidden passages or secrets in Zelda's dungeons.
In this fanfiction, Naruto's naivete in some aspects can be played upon. When he enters the world of Rangiku, he might make some cultural mistakes. This can lead to humorous and also growth - inducing situations. Rangiku's flirtatious nature could be a source of confusion for Naruto at first. But as they interact more, he begins to understand that it's just part of her charm. Meanwhile, Rangiku can be influenced by Naruto's strong sense of justice and become more involved in righting wrongs, not just having fun.
For the Rangers, their interactions with new characters can show different sides of them. If they cross over with a more light - hearted group, like the Smurfs, the Rangers might show a more patient and protective side. They'd have to keep the Smurfs safe while also dealing with the main threat.
For Sherlock, his character can be developed by showing his reaction to Merlin's magic. At first, he might be skeptical and try to find a scientific explanation. But as he witnesses more of Merlin's powers, he has to re - evaluate his world view. This could lead to a more open - minded Sherlock. For Merlin, being in a modern world with Sherlock could make him more aware of the need for secrecy regarding his magic. He might also learn to use his magic in more creative ways to solve modern - day problems.
If it's a crossover with humans, the humans can start off being afraid of the dinosaurs but then learn to understand and respect them. The development can be about the characters learning from each other. The dinosaurs could teach the humans about survival and the humans could introduce the dinosaurs to new concepts like art or music. This way, both types of characters grow in the story.
The characters can also develop through shared experiences. For instance, if they go on a quest together, they will face challenges that force them to rely on each other. Ponies might teach Lucario about the joys of celebration and relaxation, while Lucario could teach the ponies how to be more vigilant and face danger bravely. This mutual growth would make for an engaging crossover fanfiction.
Sakura would probably be very shocked at first. She might be worried about Naruto's well - being and also a bit fearful of the combined entity. Kakashi, on the other hand, would be more understanding. Given his connection to both Naruto and Obito, he would try to communicate with the merged form to figure out what happened. Sasuke would be initially suspicious, thinking it could be some new threat. But after seeing that Naruto's essence is still there, he might be more accepting and see it as a new power to use against their common enemies.
For Naruto, you can focus on his growth in a different aspect. Since he already has his ninja skills, in a story with Aplessia, he could develop his emotional intelligence further. For example, learning how to better understand Aplessia's more complex and perhaps different emotional range compared to his friends in Konoha. For Aplessia, you can start by giving her a backstory. Maybe she has a troubled past that made her the way she is, and as she interacts with Naruto, she starts to open up and become more confident.
For Naruto, his growth could be shown in relation to Tigress's no - nonsense attitude. He might become more disciplined in his training. For example, he could learn to control his rasengan better by observing Tigress's precision in her attacks. His character could also become more introspective as he tries to understand Tigress's more reserved personality.