Perhaps in this 'Boruto goes missing fanfic', Boruto is lured away by a mysterious figure who claims to have information about his future or his father Naruto's past. He follows this figure without thinking, only to find himself in a strange and dangerous place. His disappearance then sets off a chain of events in the village. People start to suspect that there might be a traitor among them who helped Boruto disappear. His teammates, like Sarada and Mitsuki, would then start their own investigation to find him, facing not only external threats but also internal doubts and suspicions within the village.
It could be the Kara organization. They've been shown to be interested in Boruto's Karma mark in the original series, so they might have finally made a move to abduct him in the fanfic.
Well, in this 'Boruto goes to the past fanfiction', Boruto could potentially change some events in the past. Maybe he tries to prevent some of the tragedies that his father and the others had to endure. But he would have to be very careful because any small change could have big consequences for the future. He might also learn some long - lost ninja techniques that were forgotten in his time, and bring them back to the future to make Konoha even stronger.
In the 'Boruto Goes Kidnapped' fanfic, it could be that the kidnappers are after some special power that Boruto has. His father Naruto would be extremely worried and start gathering all the resources in the village to find his son. Meanwhile, Boruto might be trying to escape on his own, using any opportunity he gets.
If Snape goes missing, Hogwarts would be in chaos. His students would be worried and confused. The other teachers would have to take over his classes, but no one could replace his unique teaching style.
It could be a rogue ninja who wants to use Boruto to get to Naruto. Maybe someone who has a grudge against the Hokage.
In the 'naruto trains boruto fanfic', Naruto might teach Boruto some powerful ninja techniques. For example, he could show Boruto how to master the Rasengan more effectively. Maybe he'd also train Boruto in the art of stealth and how to read an opponent's moves better.
In a 'Boruto meets Kurama' fanfic, Boruto might learn about Naruto's past with Kurama. Maybe Kurama would share some of his old battles with Boruto, giving Boruto a new perspective on his father's journey.
Sarada could also be a main character. She is strong - willed and intelligent. She could be investigating a case of a missing - nin who is suspected of being involved in some sort of conspiracy against the Uchiha clan. This would give her a chance to show her detective skills and her loyalty to her clan.
The Hogwarts letter might be the key to understanding Harry's disappearance. Since it's a connection to the wizarding world, it could be that there are hidden messages in it that only become visible when Harry is in trouble. The Ministry of Magic could get involved as well. They might suspect that Harry has run away deliberately to avoid some new danger that they are not aware of, but the letter could prove otherwise and lead to a race against time to find him before it's too late.
In the 'naruto goes to kumo fanfic', Naruto could be on a mission in Kumo. He might make new friends or enemies. He could also learn new jutsu from the ninjas in Kumo. It could be a great opportunity for him to grow as a ninja and expand his understanding of the ninja world.