One common theme is friendship. When characters from different worlds or series cross over, they often form new friendships or strengthen existing ones. Another theme is the clash of different powers and abilities. Since the characters in 'ansatsu kyoushitsu' have their own unique skills, when they cross over, it's interesting to see how they compare and combine with others.
A crossover with a post - apocalyptic world would also be interesting. The students would have to adapt their assassination techniques to survive in a world full of ruins, scarce resources, and new threats like mutated creatures or gangs. They would need to find a balance between their original mission and the new challenges of survival.
Some 'ansatsu kyoushitsu crossover fanfiction' focuses on crossovers with other school - based animes. In these stories, the students from 'ansatsu kyoushitsu' meet students from different schools with their own cultures and rules. It can lead to interesting scenarios like competing in joint school events or dealing with conflicts between the two groups.
Well, if it's crossed with a detective story like 'Sherlock Holmes', Sherlock himself could be a great addition. His deductive skills would contrast with the more action - based skills of the 'ansatsu kyoushitsu' characters. There could be a lot of interesting interactions as they try to solve mysteries together or perhaps be on opposing sides.
Another plot could involve a crossover of the two worlds' educational systems. The students from Ansatsu Kyoushitsu might attend classes in the Touhou world, learning magic instead of assassination. And vice versa, some Touhou characters could come to the school to learn about modern - day combat skills and strategies.
Well, Nagisa's ability to turn invisible could be used in the Touhou world for some sneaky spying. He could gather information on enemies while the Touhou characters, like Marisa with her powerful magic, provide the firepower. Their combined efforts would make them a formidable team against any foe.
Since I don't have much information on 'eiyuu kyoushitsu web novel', it might be about a group of students in a special classroom setting where they are trained to become heroes. It could involve elements such as different powers, rivalries among the students, and a complex plot where they have to overcome obstacles to achieve their heroic goals.
Revenge is likely a main theme. As the title 'fukushuu kyoushitsu' (which might mean 'Revenge Classroom' in English) suggests, there could be elements of characters seeking revenge within the school setting.
A good place to start is by looking for reviews or summaries online. They can give you an overview of the story and help you decide if you'll be interested. For 'Youkoso Jitsuryoku Shijou Shugi no Kyoushitsu e', understanding the school setting and the concept of 'jitsuryoku' (ability) from the start is key. So, just dive into the first few chapters and see if it grabs your attention.