In some 'Aizawa Shouta kidnapped' fanfictions, the reason for the kidnapping could be related to his past. Maybe an old enemy from his days as a student or a rookie hero resurfaces and kidnaps him to settle an old score. This enemy could put him through various trials or torture methods, while the heroes are scrambling to find him. Meanwhile, his students might also get involved, trying to rescue their beloved teacher on their own.
Perhaps in the fanfiction, Aizawa is kidnapped by a rival school or organization that wants to gain an edge in the hero world. They see his teaching skills and experience as valuable assets. They might try to brainwash him into working for them. Or, it could be that a mysterious entity kidnaps Aizawa to use him as a bargaining chip in some larger scheme involving the hero society, like getting access to classified hero information in exchange for his release.
One possible plotline could be that Aizawa is kidnapped by a group of villains who want to use his quirk knowledge against the heroes. They might hold him in a secret lair and try to force him to reveal the weaknesses of other heroes. Another plot could be that a deranged fan kidnaps him, believing that they can have a special relationship with him. The fan might keep him in a locked room, trying to convince him to like them back.
A plotline could be that Young Yagi Toshinori discovers a new power and Shouta Aizawa is skeptical at first. But as Yagi starts to train with it, Aizawa realizes its potential and decides to help him master it. This could involve some intense training sessions and moments of self - discovery for both characters.
A villain with a vendetta against Aizawa or the hero academy could be the kidnapper. For example, a villain whose plans were foiled by Aizawa in the past might seek revenge. They would have a strong motive to kidnap him and make him suffer.
There's also 'Aizawa's Hidden Wounds'. In this fanfic, it focuses on his physical injuries and how he has to deal with the after - effects while still being a responsible teacher. It shows his determination to not let his pain get in the way of his duties.
There are some amazing Aizawa Shouta crossover fanfictions in the My Hero Academia and Naruto crossovers. In these, Aizawa's skills as a hero and his ability to keep his students in line are put to the test in the Naruto world. He has to deal with ninjas and their different powers, which makes for a really engaging read.
One possible plotline could be that Keith is kidnapped by an enemy force. His friends then embark on a dangerous rescue mission, facing various challenges along the way. Maybe they have to infiltrate a heavily guarded enemy base to find and free him.
One possible plotline could be that Naruko is kidnapped by a powerful enemy who wants to use her as a bargaining chip against her friends or family. Another could be that she is kidnapped by a mysterious organization for some sort of experiment. Maybe she's kidnapped by someone who has a personal vendetta against her and plans to make her suffer.
Perhaps in this 'imprijt kidnapped fanfiction', the kidnapped person is a key figure in a grander scheme. Imprijt kidnaps them to use as a bargaining chip against their friends or allies. The friends then embark on a rescue mission filled with various challenges and unexpected twists.
One possible plotline could be that Stiles' friends immediately start a search. They might follow clues like strange footprints or a mysterious note left behind. Another could be that Stiles manages to outwit his kidnappers in some way while being held captive, perhaps by tricking them into revealing their weaknesses. Maybe the kidnappers are after something Stiles knows, like a secret about the supernatural world in the fanfiction's setting.
One possible plotline could be that Yami is kidnapped by a rival group who wants to use his special powers for their own evil deeds. His friends then embark on a dangerous mission to rescue him. Another could be that Yami is kidnapped as part of a ransom plot against someone he is close to, and they have to figure out how to meet the kidnappers' demands without sacrificing too much.
Well, it could start with Mycroft being lured into a trap and kidnapped. The kidnappers might be from a different dimension or have some sort of supernatural power. As the fanfiction progresses, Mycroft could use his wits to outsmart the kidnappers even while in captivity. There could be a lot of mind games and tense moments as he tries to escape or signal for help.