In general, Assassination Classroom Season 2 is quite faithful to the manga. Some scenes might be presented differently for visual or narrative effect, but the core story and character developments are consistent.
Well, Maehara in fanfics related to 'Assassination Classroom' can be quite interesting. He might be the center of a romantic sub - plot. Some fanfics could focus on his growth as a character, perhaps from being a bit of a class clown to someone more responsible. His skills in assassination, which are not as prominent as some other characters in the original work, might be enhanced in fanfics to give him more of a role in action - oriented scenes.
In fanfic, Karasuma can be a source of stability for the students. He is not only teaching them assassination techniques but also life lessons. His no - nonsense attitude can be a guiding force for the students, especially when they are faced with moral dilemmas in their training. For instance, when a student has to decide between a quick kill and a more humane approach, Karasuma's influence might come into play.
Karasuma in fanfic can be seen in various relationships. For example, his relationship with the other teachers and how they collaborate to handle the students. His interactions with the students also show his growth as a character. Sometimes, fanfic writers explore his past, which may not be fully revealed in the original work, adding more depth to his character.
I'm not sure exactly. It depends on how you count different editions and volumes. You might need to check with reliable manga databases or fan communities for a precise number.