The creepypasta aspect often brings in elements of mystery and horror. In the context of Harry Potter fanfiction, it could involve things like forbidden spells or dark artifacts that are puppeteering the characters in some way. It gives a chance for writers to explore the more shadowy parts of the wizarding world that J.K. Rowling only hinted at.
I'm not sure of specific titles off - hand, but you can start by looking on fanfiction websites. Search for 'Harry Potter puppeteer creepypasta' and read the reviews to find well - liked ones.
One interesting Harry Potter puppeteer fanfiction could be about a puppeteer who uses magic to bring the characters to life in a new and unique way. For example, they might create puppet versions of Harry, Hermione, and Ron that can actually interact with the real students at Hogwarts. This could lead to some really fun and unexpected adventures within the wizarding world.
One interesting 'Harry Potter creepypasta fanfiction' story is about a haunted Hogwarts. In it, students start seeing strange apparitions that seem to be the darker versions of themselves. Another could be a fanfiction where the Marauder's Map leads to a hidden and extremely dangerous part of the castle that was sealed away long ago. And there are those that play with the idea of Voldemort having an even more sinister origin or a post - Voldemort era where dark magic still lingers in unexpected ways.
One interesting crossover could be a Creepypasta character infiltrating Hogwarts. For example, Jeff the Killer could be lurking in the Forbidden Forest, adding a terrifying element to the otherwise magical place. It would be a really spooky scenario as students unknowingly get closer to this dangerous figure during their adventures in the forest.
One interesting concept could be a dark version of Hogwarts in Creepypasta fanfiction. For example, the hallways filled with more menacing creatures than in the original series. Another could be a character from Harry Potter being trapped in a Creepypasta - like nightmare world where the rules of magic are distorted. And some fanfictions might explore the idea of a cursed Hogwarts artifact that has Creepypasta - style effects on those who come in contact with it.
One idea could be a dementor - like Creepypasta character that haunts Hogwarts. It could drain the happiness not just of students but also start affecting the very magic of the school. Another could be a character from Creepypasta getting lost in the Forbidden Forest and encountering magical creatures in a much more menacing way than the usual. Maybe a Creepypasta villain who tries to steal the Philosopher's Stone for some dark and twisted reason related to their own strange world.
One idea could be a story where the dementors from Harry Potter cross over into the Creepypasta world. They could start spreading their despair in the already creepy and dangerous Creepypasta settings, making it even more nightmarish. Another could be a crossover where a Harry Potter character like Hermione accidentally enters a Creepypasta realm and has to use her magic and wits to survive among the various Creepypasta entities.
In a Harry Potter Creepypasta - Jeff Fanfiction, perhaps Jeff is a Muggle - born who discovers his dark side after being rejected by the wizarding community. He then uses his own brand of 'magic' which is more like dark, disturbing abilities. This could lead to a whole new set of adventures where the regular Harry Potter characters have to deal with this unorthodox threat.
Well, perhaps it could explore alternative universes where Harry isn't a Potter at all. It might change the whole dynamic of the story, like his relationships with other characters. For example, without the Potter name, his connection with Snape could be entirely different, as Snape's animosity towards Harry was partly due to his father being James Potter.
One possible plot could be that Harry stumbles upon an old puppeteering book in the Hogwarts library and becomes fascinated. He then starts to create his own magical puppets which help him in his adventures.