Harry Potter himself is a very likely character to be missing. He's the central figure in the series, and his disappearance would create a huge upheaval in the wizarding world. His friends would be desperate to find him, and the whole Hogwarts community would be on edge.
Dumbledore could also be a character who goes missing in action. He's a powerful and wise wizard, and his absence would leave a power vacuum. It could lead to a struggle for control within Hogwarts and among the wizarding leadership. There would be a lot of mystery and speculation about where he has gone and what he was doing before he disappeared.
Another plotline could involve a group of Death Eaters who are missing in action but are actually planning a huge comeback. They could be secretly gathering forces and creating new dark magic artifacts. The story could follow a young Auror who discovers their plot and tries to stop them before they unleash chaos on the wizarding world.
The Akatsuki could be antagonists. Even if they were defeated in the original story, in the fanfiction they might have a new plan and have kidnapped Naruto for some reason related to the tailed beasts. For example, they might want to use his Nine - Tails chakra to revive a powerful member or complete a dangerous jutsu.
Yes, it is. 'Missing in Action' is often inspired by real-life events or based on true stories that have been adapted for the screen.
In 'harry potter is betrayed fanfic', Luna Lovegood might be a character who betrays Harry. Maybe she is under the control of some mind - altering spell or has been deceived by a false prophecy that makes her think she is doing the right thing by betraying him. Also, Hagrid could be a shock betrayer if he is somehow forced to choose between Harry and his beloved magical creatures, and chooses the latter in a way that is seen as a betrayal to Harry.
Perhaps Bellatrix Lestrange had a secret accomplice who was also interested in the Potter family. After Bellatrix's death, this accomplice decides to hunt down the missing sister to finish what Bellatrix started - destroying the Potter family once and for all.
It's a mystery! You'll have to read the fanfiction to find out exactly what happened.
Even Ginny could be written as a betrayer in a fanfic. For example, if she becomes possessed by a dark force, she might turn against Harry. Her relationship with Harry is so central in the original story that a betrayal from her would be a huge shock and create a lot of drama in the fanfic.
Harry Potter himself could be a main character. He has a history of standing up against injustice, so it's likely he'd be involved in a revolt. Hermione would also be a key figure. Her intelligence and knowledge of the wizarding world's laws would be invaluable in planning and leading a revolt. Ron, with his loyalty and courage, would be right there with them.
Harry Potter would probably be one of the main characters. He's the central figure in the original series, so it's likely he'd be involved in this fanfic in some capacity, perhaps as the hitman or someone related to the hitman - style plot.
Well, Ron is also a candidate. He might get tired of all the chaos in the Gryffindor common room or just need some time away from his friends to think. 'Taking the air' would be a good way for him to do that. Luna Lovegood could also be a character who 'takes the air'. She has a unique perspective on things, and being outside in nature might be something she enjoys, perhaps to observe some magical creatures or just to be in her own world.