A former student of the academy who left under mysterious circumstances could be the undercover professor. They come back with a new identity to right some wrongs that happened in the past, and they know the ins and outs of the academy already, which gives them an advantage in their undercover role.
It could be a young and brilliant detective who goes undercover as a professor. They have sharp observational skills and are used to solving mysteries.
Since I haven't read the novel, I'm not sure. But I assume the undercover professor is one of the main characters. There may also be some students who get involved in the story, either by accident or because they are somehow related to what the professor is investigating.
The undercover professor is the central figure. Alongside him, there could be a dean or a headmaster of the academy who might be either in on the professor's mission or unknowingly be part of the problem he's investigating. And there might be a group of students with unique personalities. For instance, a brilliant but rebellious student who catches the professor's attention, or a shy student who has some hidden knowledge relevant to the professor's case.
Well, without having read the specific 'academy's undercover professor novel' in detail, it's hard to say exactly. But generally, it might involve a professor who is undercover in an academy for some mysterious reasons, perhaps to uncover a conspiracy or to protect someone.
One idea could be that the undercover professor has a secret mission to protect a special student. Maybe the student has a unique power or knowledge that dangerous forces are after. Another could be that the professor is actually from a rival academy, undercover to steal some important teaching methods.
Well, in a 'academy undercover professor' light novel, it might revolve around the daily life of this undercover professor. He would have to blend in with the regular faculty and students while also trying to achieve his own goals. He could be facing challenges like hiding his true identity from smart students who are suspicious, and at the same time dealing with the normal academic affairs. For example, he may need to teach classes while secretly looking for clues about whatever he's investigating.
One common theme is the revelation of secrets. The undercover professor usually has a hidden past or a special mission, and as the story unfolds, these secrets are gradually revealed, which keeps the readers intrigued.
The main character is obviously the undercover professor. There may also be some key students that he interacts with.
One well - known 'academy undercover professor' - like novel could be 'The Irregular at Magic High School'. In this novel, the protagonist has a certain hidden identity within the academy setting which is somewhat similar to the concept of an undercover professor. He has extraordinary abilities that he doesn't fully reveal at first.
Maybe an orphaned wizard who has a connection to Snape's past. Snape feels a sense of obligation to protect him. This wizard could be the son of an old acquaintance of Snape's, and his presence in Hogwarts stirs up old memories and emotions for Snape. The fanfiction could revolve around how Snape deals with these emotions while protecting the young wizard.
The theme of discovery might be prominent. As the undercover professor goes about his or her business in the story, there would be a discovery of new things in the environment, whether it's about the students, the academic institution, or some hidden secrets of the world in which the story is set. Also, there could be a theme of conflict. There may be conflicts arising from the need to keep the undercover status while also having to deal with various situations that might expose it.