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.
For Merlin, you can focus on his internal struggle with his magic. In fanfiction, he could be more open about his powers with Lancelot and Guinevere, which would change their dynamic. He might teach them some basic magic defenses, which would show his trust in them.
One idea could be that Merlin uses his magic to help Sherlock solve a case that seems to have supernatural elements. For example, a series of murders where the victims all seem to have died from some unexplainable force. Merlin's ability to sense magic and his knowledge of the old ways could give Sherlock new perspectives on the case.
For Merlin, he could start as a naive character who is initially attracted to the material benefits offered by the 'sugar daddy'. But as the story progresses, he realizes the importance of his own values and magic. He could grow to be more assertive and use his relationship to gain power not for himself but for the greater good. For the 'sugar daddy' character, if he is initially portrayed as self - centered, he could develop feelings for Merlin and start to change his ways, becoming more altruistic.
Merlin can be developed by showing his growth as a strategist. As a soldier, he would need to learn how to plan battles and outwit his enemies. His skills in magic could be incorporated into his military strategies, making him a unique and formidable force on the battlefield.
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.
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.
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.
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.
Sherlock could be highly skeptical of Doctor Strange's magic at first. He might constantly try to find logical explanations for the magical phenomena. Doctor Strange, in turn, could be amused by Sherlock's attempts and then gradually show him the true power of magic. For example, Strange could use his magic to recreate a crime scene in a different way to help Sherlock see new angles of a case.
Well, Jack Harkness from Torchwood would probably be quite intrigued by Sherlock's deductive abilities. He might initially test Sherlock, throwing out strange cases to see how he solves them. Sherlock, on the other hand, would likely be a bit put off by Jack's flamboyant nature at first but would soon realize his value in dealing with the more otherworldly aspects of cases.