One interesting concept could be a xenomorph crossover with a superhero universe. Imagine a xenomorph invading a city where superheroes exist. The heroes would have to use their unique powers to fight this alien threat. For example, a telekinetic hero could try to hold the xenomorph in place while others figure out a way to kill it.
A xenomorph crossover with a fantasy world is also cool. Picture a xenomorph in a medieval-like setting with knights and magic. The knights would be ill - equipped to deal with such a creature at first, but with the help of magic - users, they might find a way. Maybe a wizard could try to cast a spell to banish the xenomorph back to its own dimension.
Another concept could be a crossover with a post - apocalyptic world. In a world already ravaged by some other disaster, the appearance of a xenomorph would add another layer of chaos. Survivors would have to use their wits and whatever resources they have left to fend off the xenomorphs, perhaps even teaming up with other mutated creatures against this common enemy.
One interesting concept could be the combination of different character abilities from the original 'danmachi' and the crossed - over universe. For example, if it's a crossover with a magic - heavy world, seeing how the 'danmachi' characters adapt to and use new forms of magic would be really cool. Another concept might be the cultural clashes. Characters from 'danmachi' might have different values and social norms compared to the characters from the other world in the crossover, and exploring how they interact and deal with these differences can make for an engaging story. Also, the new relationships that form between characters from both universes, whether it's friendship, rivalry or even romance, add depth to the fanfic.
One interesting concept could be a crossover with other Victorian - era related works. It might bring in different characters and storylines from that time period, adding more depth to the Kuroshitsuji universe. For example, a crossover with Sherlock Holmes - like characters could lead to some exciting detective - related plots within the Kuroshitsuji world.
One interesting concept could be the crossover of DBZ characters with characters from other popular anime. For example, a crossover with Naruto characters might lead to some epic battles between Goku and Naruto. They could exchange fighting techniques and learn from each other.
One interesting concept could be the crossover of Voltron with other popular sci - fi universes. For example, a crossover with Star Trek might involve the Voltron team having to navigate the complex politics and technology of the Federation. Another concept could be a crossover with a more fantasy - based universe like Lord of the Rings, where the Voltron lions could be seen as powerful magical beasts in Middle - earth. And in a crossover with a superhero universe like the Marvel Cinematic Universe, the Voltron pilots could team up with the Avengers to fight a common enemy.
One interesting concept could be the interaction between BlackWarGreymon and characters from different universes. For example, how he would react to meeting characters with very different moral compasses or powers. Another concept might be his journey in a new world created by the crossover, facing new challenges and making new alliances or enemies.
Well, in 'jojo crossover fanfic', a common concept is the fusion of stands. Imagine if Star Platinum and Gold Experience combined their powers in some way. This would lead to really creative battles and problem - solving within the fanfic's plot. Also, crossovers might include Jojo characters in different settings like modern day New York instead of their original locations, which is super cool.
One interesting concept could be the crossover with other popular anime. For example, crossing over with 'Your Lie in April' might bring a unique blend of the two stories' emotional tones. The characters from 'oregairu' could interact with the musically - inclined characters of 'Your Lie in April', creating new and unexpected relationships and storylines.
One interesting concept is the combination of different Fate series characters in unexpected scenarios. For example, seeing characters from Fate/Stay Night interact with those from Fate/Grand Order. It can create unique storylines and character dynamics.
One interesting concept could be Pikachu crossing over with other Pokémon in unexpected ways. For example, a crossover with a water - type Pokémon like Squirtle might lead to Pikachu having to adapt to an aquatic environment, which could bring about new adventures and challenges.
One interesting concept could be a 'Warhammer' crossover with 'Lord of the Rings'. Imagine the orcs from 'Warhammer' interacting with the orcs from Middle - earth. Another could be a crossover with 'Star Wars', like the Space Marines teaming up with the Jedi or Sith in some strange alternate universe scenario. And a 'Warhammer' and 'Harry Potter' crossover where the magic of the wizarding world meets the dark and gritty world of 'Warhammer' would also be really cool.