There's also 'Tokyo Ghoul: OC's Unlikely Harem'. This one stands out because it delves deep into the psychological aspects of the OC being in a harem situation. It shows how he struggles with his feelings for different characters while also trying to survive in the dangerous world of Tokyo Ghoul. The character development is top - notch and the relationships feel very real.
One important aspect is the plot. It can't just be about the OC collecting a bunch of characters for a harem. There should be a real story, like maybe the OC is on a mission to change the relationship between ghouls and humans and the harem members are either helping or hindering that. The fanfiction should also stay true to the overall tone of Tokyo Ghoul, which is often dark and gritty.
One great Tokyo Ghoul x Reader fanfiction is 'A Ghoul's Embrace'. It has a really engaging plot where the reader character gets caught up in the complex world of ghouls in Tokyo. The author does an amazing job of portraying the emotions and the struggle for survival.
One great Black Butler fanfiction is 'The Butler's New Adventure'. It takes Ciel and Sebastian on a journey to a new, mysterious land filled with unique challenges. For Tokyo Ghoul, 'A Ghoul's Redemption' is quite interesting. It explores the idea of a ghoul trying to live a more peaceful life among humans. There are also some crossover fanfics that combine both universes in really creative ways.
There's a fanfiction titled 'Hybrid Realms'. In this one, the author creates a whole new scenario where the two universes are on the verge of merging. The main characters from both Tokyo Ghoul and High School DxD have to team up to prevent chaos. It has a great plot with lots of action and character development.
One interesting fanfiction could be one where Sakura Haruno somehow gets transported into the Tokyo Ghoul world. In this story, she might use her medical skills from Naruto to help the ghouls with their unique biological needs. Maybe she teams up with Kaneki to find a way to co - exist between humans and ghouls in a more peaceful way.
One great Tokyo Ghoul Kaneki crossover fanfiction is the one where he crosses over with the world of 'Attack on Titan'. It's really interesting to see how Kaneki's ghoul abilities interact with the Titans. The author does a great job of creating a believable scenario where the two worlds collide.
To create a compelling Ghoul OC in Tokyo Ghoul fanfiction, first consider their backstory. Maybe they were turned into a ghoul under tragic circumstances, like losing a loved one in a ghoul attack and then being turned. Their kagune is also important. It could be a unique shape or have special abilities, for example, a kagune that can change color to blend in with the environment. Their personality should be complex. They could be conflicted between their human side and the newfound ghoul instincts. For instance, they might still feel empathy for humans but also need to feed on them to survive.
One interesting female Kaneki fanfiction could be one where she forms an unexpected alliance with a group of ghouls from a different territory. In this story, she might use her unique perspective as both human and ghoul to bridge the gap between different ghoul factions. It could explore her internal struggle in a new light as she tries to maintain her humanity while also fitting into the ghoul world.
I really like 'Kaneki's Female Companion'. In this fanfic, the female character has a unique backstory that intertwines with Kaneki's. It shows how their relationship develops in the dark and dangerous world of Tokyo Ghoul. The author does a great job of keeping the essence of the original Tokyo Ghoul while adding their own creative twists.
One interesting fanfic could be 'The Wizarding World and the Ghouls'. It combines the magical elements of Harry Potter with the dark and gritty world of Tokyo Ghoul. It might have Harry Potter characters somehow transported to the Tokyo Ghoul universe and they have to deal with the ghouls while still having their magical abilities. However, the story might also explore how the two different power systems interact and conflict with each other.