Some crossovers involve Western and Japanese fictional universes. For instance, a crossover between 'Supernatural' and a harem anime world. The Winchester brothers might find themselves in a world where they are surrounded by a harem of female characters with unique powers from the anime realm. These types of stories often blend different story elements, character personalities, and power systems in creative ways.
In the world of anime crossovers, a 'One Piece' and harem crossover fanfiction can be quite interesting. Picture Luffy having a harem of various female pirates or island princesses from different parts of the 'One Piece' world and other crossover universes. There are also crossovers involving 'Dragon Ball' where Goku, in a different take on his character, has a harem of female Saiyans and other alien races from different fictional settings.
One popular theme is the clash of different cultural elements from the various source materials in the crossover. For example, if it's a harem crossover between a Japanese anime and a Western fantasy series, there might be a contrast between the Japanese concepts of honor and the Western ideas of chivalry. Another theme could be the power dynamics within the harem. Different characters from different universes may have different levels of power, and how they interact and compete or cooperate in the harem setting can create interesting storylines. Also, the exploration of love in a multi - character context is a big theme. Each member of the harem may have a unique relationship with the main character, and the story could focus on how these relationships develop and evolve over time.
One popular story could be 'Naruto's Multiverse Harem Adventure'. In this type of fanfiction, Naruto often finds himself in different crossovers with various universes and forms relationships with multiple characters. Another might be 'Naruto and the Crossover Harem', where his unique ninja skills attract different characters from other series into his harem.
One popular theme is the interaction between different species from the Mass Effect universe in the context of a harem. For example, how a human character might interact with asari, turians, etc. Another theme could be the exploration of different cultures within the Mass Effect world through the harem relationships. It often involves elements of adventure and romance combined, as the main character navigates the complex relationships while also dealing with the larger threats in the universe.
A crossover with 'One Piece' is also quite common. Just imagine the chaos that would ensue if the Straw Hat crew landed in the world of Highschool DxD. Luffy's carefree attitude and his powerful devil fruit abilities would be a great contrast to the more serious and power - hungry devils in DxD. And of course, his nakama would surely get involved in the harem situation in some way. Maybe Nami would be interested in the treasures that the devils possess, or Sanji would be chasing after the female characters in DxD.
Some storylines might focus on the cultural clash between the Naruto universe and the Gundam universe within the harem context. Naruto's values from his ninja world, like loyalty and friendship, could be something that the Gundam characters admire and are drawn to. In a story, the female Gundam characters might compete for Naruto's attention while also learning about his world. Maybe Naruto has to train some of them in ninja techniques, and this brings them closer together.
Well, a common plotline in Naruto and Bleach crossover harem fanfiction is the idea of a power - sharing or power - combining concept. Let's say a character has to combine the chakra from Naruto's world with the reiatsu from Bleach. In this process, they form bonds with various female characters from both universes, creating a harem. For instance, if Sasuke somehow gets involved in this cross - over, his brooding and powerful nature might attract female characters who want to understand his powers better and be part of his journey. Also, the search for a way to return to their respective universes could be a central plot, during which the harem forms around the main character.
One common theme could be the exploration of different character relationships within the harem. For example, how the different characters interact with the main character who has a 'big cock' (in a non - vulgar, more of a fictional characteristic sense). Another theme might be the power dynamics, as the main character's unique trait could give them an edge in the harem setting.
Some popular ones often involve anime or book series. For example, in the 'Naruto' fanfiction realm, there are harem stories where the main character, Naruto, is paired with multiple female characters from the series. These stories usually play on the idea of the main character's charm and how different relationships could develop.
Crossovers between 'Sherlock' and 'Elementary' can be interesting too. Imagine Sherlock Holmes from the BBC's 'Sherlock' and Joan Watson from 'Elementary' working together on a case that spans both their versions of New York City. It would be a clash of different interpretations of the classic characters.
One popular storyline could be Saitama getting transported to a different universe full of harem anime characters. He might then have to deal with the various personalities and powers of these characters while still being his overpowered self. Another could be the harem characters being brought into the One Punch Man world and how they adapt to its unique setting and Saitama's laid - back attitude. There could also be a story where a villain tries to use the harem characters to distract Saitama from saving the world, but of course, Saitama is unfazed.