Snape might suspect that there is some dark magic at play. Given his knowledge and expertise in the Dark Arts, he would immediately look into any signs of foul play. He could also be conflicted because on one hand, Harry is a student he has had many issues with, but on the other hand, he is also an important figure in the fight against Voldemort. So he would have to decide whether to report Harry's disappearance or try to handle it privately.
Well, in the fanfiction, Snape finding a run - away Harry Potter could lead to a whole new adventure. Snape could end up having to team up with some of Harry's friends, like Hermione and Ron, to find him. This would be a very strange and tense alliance. Snape would have to put aside his grudges and the students would have to trust him, which would be difficult for both parties. It could be a story full of character development and unexpected friendships.
Snape would likely be angry at first. Harry has always been a source of trouble in his eyes, and running away would just add to that perception. He might mutter some sarcastic remarks under his breath about Potter's irresponsibility.
Well, if Harry Potter finds Excalibur, it could completely change the wizarding world. He might gain some new powers from the sword. Maybe he could use it to defeat Voldemort in a more epic way than with his own wand. It could also bring a new alliance between the wizarding world and some other magical beings who respect the power of Excalibur.
Well, he might discover a whole new world of magic in that fanfiction. Maybe it contains spells that are not in the original books. He could get inspired to try out new things or it could even lead him to new adventures within the Hogwarts library, like finding a hidden section related to the ideas in the fanfiction.
If Snape finds Harry Potter fanfiction, he'd probably be quite irritated. He has a rather stern and no - nonsense personality. He might see it as a frivolous waste of time and be disdainful of the creative liberties often taken in fanfiction. He'd likely scoff at the idea of people writing about his students and the wizarding world in such unregulated ways.
Well, it might result in a confrontation. Snape has his own secrets and motives, and Hermione is not one to back down easily. If she's in the dungeon without permission, Snape could be quite harsh with her. However, some fanfictions take this in a different direction. Maybe Hermione discovers something about Snape's past while in the dungeon, and this knowledge makes Snape more vulnerable in front of her. It could be a turning point where their relationship goes from antagonistic to something more complex and nuanced.
Well, if Harry Potter finds the Mask of Zen - Aku, it could lead to a lot of chaos. Maybe the magic of the mask would interact in strange ways with Harry's own magic. He might struggle to control the power of the mask and find himself in situations where he has to make difficult choices between using the mask's power for good or being corrupted by it.
He could end up selling the devil fruit. In some fanfictions, devil fruits are extremely valuable and sought - after items. Harry might not want the power or the responsibility that comes with it, so he decides to cash in on it. But this could also attract all kinds of unwanted attention from powerful and dangerous characters who want the fruit for themselves.
In fanfiction, the possibilities are endless. It could be that they go on an adventure to a previously unknown magical land or face a powerful dark wizard who was thought to be defeated.
Well, it could go in many directions. They might travel to a previously unknown magical realm or encounter creatures that were only hinted at in the original series.
He could run to the Forbidden Forest. It's a place full of mystery and danger, but also a good hiding place as it's vast and not many people would expect him to be there. He might find some solace among the magical creatures there.