The 'fish - out - of - water' trope can be great. Like when Spider - Man first arrives in Red Sonja's world. He's used to the modern cityscape of New York and now has to deal with a medieval - like environment full of swords, sorcery, and different social norms.
A possible crossover could involve Spider - Man getting transported to Red Sonja's world. He would have to adapt his powers to a more medieval - style setting. He could use his webs to swing between the ancient buildings and help Red Sonja in her battles against the local tyrants. Red Sonja, in turn, could teach him some of her sword - fighting techniques.
One great Red Sonja fanfiction is 'The Redemption of Sonja'. It has a really interesting plot where Sonja has to face her past mistakes and make amends. The author does a great job of portraying her strong character.
One of the best Red Sonja stories is 'Red Sonja: Queen of Plagues'. In this story, Sonja shows her tenacity and combat skills as she battles against a deadly plague and the forces behind it. Her character is well - developed, and the story is filled with action - packed scenes.
The 'team - up' trope is always popular. Whether it's Spider - Man teaming up with Deku and his friends to take on a powerful villain, or the MHA heroes joining Spider - Man to fight a threat in New York. Also, the 'mentor - mentee' trope can work well. Spider - Man could mentor a young hero in MHA, teaching them about responsibility and using their powers effectively.
Well, 'Red Sonja: The Ring of Ikribu' is also a good one. It delves into her adventures in a more mysterious setting and introduces some interesting characters that add depth to the story.
There could also be the 'protective - partner' trope. For instance, either Sonja or Christopher might find themselves in a dangerous situation, and the other steps up to protect them. This trope plays on their loyalty and friendship, and in some cases, can be a precursor to a deeper relationship.
The 'fish - out - of - water' trope is quite popular. Since Spider - Man is from New York and Wakanda is a very different place, seeing him struggle to understand Wakandan customs while Shuri finds his confusion both amusing and endearing. For example, when he first tries Wakandan food or attends a Wakandan ceremony.
One popular trope is the crossover aspect itself. Writers often like to bring the characters from Spider Man and Vampire Diaries together in unexpected ways. For example, having Spider Man face off against the vampires in Mystic Falls. Another is the 'fish out of water' trope, like if Peter Parker somehow ended up in the Vampire Diaries' universe and had to adapt to its rules.
One popular trope is the mentorship. Since Spider - Man has a connection with Tony Stark in the movie, fanfictions often expand on this. Another is the 'fish out of water' trope where Spider - Man is out of his comfort zone when dealing with the Avengers' big - scale operations.
Another theme is the power dynamic. Red Sonja is a powerful warrior in her own right, and Naruto has his own set of extraordinary abilities. Fanfictions often play around with how they compare in terms of strength and who takes the lead in different situations. Sometimes it's a friendly competition, other times it's a more serious struggle for dominance.