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.
I'm not sure specifically as it's not a widely known common title. It could potentially be about revenge of a pig in a fictional context, but without more information it's hard to say for sure.
I'm not sure specifically as there could be various stories within a 'spy kyoushitsu novel'. It might be about spies in a classroom setting perhaps, with elements of mystery, espionage, and the interaction between the characters in that unique environment.
Since I haven't read this particular 'fukushuu o koinegau light novel', it's hard to say for sure. However, generally in light novels, if it has 'fukushuu' in the title which means revenge, it could center around a character seeking vengeance for some wrong done to them. It may involve a complex web of relationships, power struggles, and a journey of the protagonist towards achieving their revenge, all while set in a fictional and often fantastical setting that is characteristic of light novels.
Since it's a 'spy kyoushitsu novel', the main characters might include a young and intelligent student who discovers the world of spying within the classroom. There could also be a mysterious figure, perhaps a janitor or a visiting lecturer, who is actually a high - ranking spy guiding the protagonist. And of course, there may be some antagonists like other spies from rival organizations trying to disrupt the operations happening in the classroom.
Well, without having read the 'spy kyoushitsu light novel' myself, it's hard to say exactly. However, based on the title, it seems likely that it has a story centered around a spy in a classroom. Maybe the spy has been sent to gather intelligence on a particular person or group within the school. It could also involve the spy having to balance their secret identity with fitting in as a normal student, which would create a lot of tension and interesting plot twists. There might be other elements like rival spies or unexpected allies within the school community as well.
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.