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, 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 exploring Snape's childhood before Hogwarts. Maybe he had a secret friendship with a Muggle that no one knew about. This could add depth to his character and explain some of his later actions.
One idea could be that Harry becomes a Defense Against the Dark Arts professor. He could teach students unique spells and techniques he learned from his own adventures. For example, he might introduce a class on how to combat dementors using the Patronus charm in more advanced ways. Another plot could involve Harry dealing with a student who has a connection to Voldemort, just as he did, and he has to guide the student to the right path. He could also face challenges from the school board who are skeptical of his teaching methods because of his unorthodox background.
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.
Perhaps she has inherited Snape's talent for potions and is trying to prove herself in Hogwarts while also dealing with the reputation her father has. She could be bullied because of Snape's cold exterior but then show her classmates her own unique charm and skills.
A plot could revolve around a time - traveling aspect in Lego City Undercover fanfiction. The protagonist accidentally activates a time - traveling device and ends up in the past of Lego City. They have to find a way to get back to their own time while also making sure not to change the past in a way that would destroy the future of the city. This would involve a lot of exploration of Lego City's history and its evolution over time.
One plot idea could be that Ziva and Tony are undercover as a married couple at a high - society event. They have to blend in and gather intel on a criminal who is using the event to launder money. Another could be that they are undercover in a dangerous cult to rescue a kidnapped agent, and during their time there, they start to realize new things about each other. A third idea is that they go undercover as rival spies in an international arms deal, but their fake rivalry starts to turn into something more real and they have to deal with their feelings while still completing the mission.
Well, a plot could involve Merlin being undercover as a new student who is actually there to protect the school from a dark magical force that only he can sense. He might have to form an unlikely alliance with the school outcast who turns out to have some latent magical ability. Or he could be in a situation where he has to participate in a school magic competition while hiding his true power level.
One idea could be a story where a young trainer teams up with Professor Sycamore to research a new and mysterious Pokemon species that has been causing strange phenomena in the Kalos region. They embark on a journey filled with challenges and unexpected encounters.
One idea could be exploring Regulus Black's time as a professor and his relationships with students. Maybe he has a student who reminds him of his younger self, and he tries to guide them away from the dark path he once walked. Another could be a mystery where he has to solve a magical riddle in the school that is linked to his past secrets.