There are indeed some great ones. Fanfiction allows for a lot of creativity. In these types of crossovers, the settings and rules of both universes are often blended. For example, the magical spells from Harry Potter might be used in the context of the K Project's world, or the clans in K Project could have some sort of connection to the houses in Hogwarts. It gives a whole new perspective to both universes and is a great read for fans of either or both.
Sure. A lot of fanfiction writers like to explore new ideas by mixing different popular universes. In 'Harry Potter K Project' fanfiction, you could see things like Hogwarts students visiting the world of K Project or vice versa. They might have to face new challenges and make use of both magical and K - related powers. It's really creative and interesting to read.
Well, you could create a fanfic where the Sorting Hat from Harry Potter is used in the K Project world. Characters in the K Project could be sorted into houses based on their personalities, just like in Hogwarts. Or perhaps a character from Harry Potter accidentally travels to the K Project universe and has to find their way back while getting involved in the political intrigue and power struggles there. They could use their magic in unexpected ways within the K Project's setting.
Archive of Our Own is a great place to start. It has a large collection of fanfiction from various fandoms, including crossovers like 'Harry Potter K Project'. You can also try Fanfiction.net, though the selection might be a bit different.
Harry Potter himself would be very interesting. Imagine him in the world of the K Project, trying to understand their power systems while still having his own magic. He could be a bridge between the two worlds, using his Gryffindor courage to face the challenges in the K Project universe.
Some 'k project fanfiction' stories are centered around shipping characters. For instance, fanfictions that pair Mikoto Suoh with Totsuka Tatara in a romantic relationship often explore how their personalities would interact on a more intimate level, adding a whole new layer of emotional depth to their friendship shown in the original anime.
In Harry Potter 40k fanfiction, a cool concept is the idea of the Death Eaters being influenced by Chaos. Imagine if Voldemort's followers started to dabble in the powers of Chaos, how would that change the dynamics of the wizarding world? Also, the magical creatures in Harry Potter could have new interpretations in 40k. For instance, Hippogriffs might be seen as more menacing or used in different ways in the war - torn 40k universe.
One interesting k project oc fanfiction could be about an OC who has the power to manipulate time in the k world. They might use this power to prevent certain tragic events from happening. Another could focus on an OC who is a detective trying to solve the mysteries behind the different clans in the k universe.
The character interactions are really interesting. Imagine Harry Potter meeting a Space Marine or a Chaos Sorcerer. How would they communicate? How would their different moral compasses and worldviews clash? These fanfictions explore such interactions in great detail. For example, a story might show Harry trying to convince a Space Marine that magic can be a force for good, while the Space Marine is skeptical due to the corrupting influence of chaos in his own universe. It makes for some really engaging reading.
One idea could be to focus on the Weasley family. For example, create a story where the younger Weasley siblings start a secret club at Hogwarts to preserve and study the family's magical traditions that are in danger of being forgotten. They could face challenges from other students who think their traditions are old - fashioned.
One possible plot could be that Naruto somehow gets transported to the world of the K Project. There, he meets the different clans and characters. Maybe he teams up with some of the Kings to fight a common enemy that threatens both his world and the K Project world.
Well, 'Time - Twisted in K' is also a popular one. In this fanfic, the time travel aspect is used to bring back a character who was lost. It has a lot of emotional moments as the other characters react to the return of their friend in a time - altered situation. The plot is full of twists and turns that keep you hooked from start to finish.