Explore his moral compass. Maybe he starts off as a morally ambiguous character but through his experiences in the fanfiction, he begins to question his actions and values. You could show his internal struggle between self - interest and doing the right thing in different situations, which would help in developing his character further.
A power - hungry international arms dealer could be a great antagonist. They would constantly be trying to outmaneuver Ravenschild and sell dangerous weapons to the wrong people.
One idea could be a crossover where the Ravenschild character teams up with the main characters from 'Man from Uncle' to solve a mystery that spans different continents. Maybe it involves a stolen ancient artifact that has some sort of technological secret within it.
One idea could be Ravenschild going on a solo mission that involves infiltrating a high - security enemy base. He could use his unique skills and gadgets to outwit the guards and steal crucial information.
Their relationship could be developed by having them face a life - threatening situation together and realizing how much they depend on each other. For example, being trapped in a collapsing building during a mission.
Their relationship could develop further through shared challenges. For example, if they face a powerful new villain together. Working side by side, they would learn more about each other's strengths and weaknesses, and this would deepen their bond.
Another way is to put him in situations outside of Wakanda that test his beliefs. Send him on a mission to another oppressed nation where he has to decide whether to use force or diplomacy. This would show how flexible or rigid his ideology really is and help to develop his character in new directions.
Show his vulnerability. In the original, he seems all - powerful and menacing, but in fanfiction, you could give him moments of weakness. Maybe he has nightmares about his past actions or there are certain things that can physically harm him in ways not shown in the original. This would make him a more rounded character. Also, explore his relationships with other characters on a more emotional level. Does he have any friends, or is he truly alone? And if he has friends, how does he interact with them? This can all add depth to his character.
Naruto would likely become more determined and strategic. Having to save Sakura from Orochimaru would make him realize the importance of being more than just brute force. He might start to study Orochimaru's techniques more carefully, which would increase his knowledge of different types of jutsu. This would also make him more respected among his peers as they see his growth in handling complex and dangerous situations.
Another way is if Naruto starts to teach Kurama about the positive aspects of human nature, like friendship and loyalty. This could make Kurama more empathetic towards humans and strengthen their bond. Kurama, in turn, could share his ancient wisdom with Naruto, making Naruto a wiser ninja.
First, decide which universe you want to cross 'Man from Uncle' with. Then, study the characters and settings of both. For example, if it's with 'Star Trek', understand how the technology and social structures differ. Next, create a plot that forces the characters from both to interact, like a common enemy or a shared mission. Keep the personalities of the 'Man from Uncle' characters intact while adapting them to the new situation.