A plot could involve the Black Reaper's attempts to find a cure for his condition. He could travel to different parts of the world in search of ancient ghoul lore that might hold the key to his salvation. Along the way, he meets other powerful ghouls who either try to stop him or help him. Another plot idea is that the Black Reaper is framed for a series of ghoul attacks he didn't commit. He has to clear his name while also dealing with the hunters who are now after him. This could lead to some intense chase scenes and battles. The third idea is a love story where the Black Reaper falls in love with a human who is unaware of his true nature, and he has to decide whether to tell her and risk everything or keep it a secret.
Well, you could write a fanfiction where the Black Reaper discovers a new power within himself. This power could be both a blessing and a curse as it attracts unwanted attention from both ghouls and humans. For example, it might make him a target for powerful ghoul organizations that want to use his power for their own gain. Another plot could be centered around the Black Reaper's past relationships. Maybe an old acquaintance from his past as a human resurfaces in his ghoul life, and this person has a vendetta against him. This could lead to a complex web of emotions and conflicts. And then there's the idea of the Black Reaper starting his own group of outcast ghouls. He tries to create a safe haven for those who don't fit into the traditional ghoul or human society.
One idea could be exploring the Black Reaper's inner turmoil as he struggles between his human and ghoul sides more deeply. Maybe he has to make a choice between protecting a group of innocent humans or siding with a ghoul community that has shown him kindness. Another could be a time - travel plot where the Black Reaper goes back to a crucial moment in his past to change something, but discovers that changing the past has unforeseen and dangerous consequences. And a third idea could be a story where the Black Reaper teams up with an unlikely ally, like a human detective who is also trying to solve a mystery related to the ghoul underworld.
One plot idea could be your OC being a new ghoul trying to find their place in the ghoul society. They might start at the bottom, having to learn the rules of the different ghoul groups and facing discrimination from more established ghouls. Another idea is that your OC discovers a secret about their transformation that no one else knows, like it was part of a secret experiment by the CCG. They then have to figure out what to do with this knowledge while also avoiding being caught by the CCG.
One plot idea could be that a character from Tokyo Ghoul ends up in Ikebukuro (the setting of Durarara). For example, Kaneki could find himself in the middle of the Dollars' activities. He might initially be confused by the different kind of chaos compared to the ghoul world. Another idea is that Celty's head mystery somehow gets intertwined with the ghouls' existence. Maybe there's a ghoul who has knowledge about her head, and this leads to an alliance between Celty and some of the Tokyo Ghoul characters to find out the truth. A third plot could involve the gangs in Durarara getting involved with the ghoul - human conflict in Tokyo Ghoul. They might try to take advantage of the situation for their own gains, but end up getting more than they bargained for as they learn about the true nature of ghouls.
You could create an OC who is a ghoul investigator from a foreign country. This OC would bring different techniques and perspectives to the fight against ghouls. They might also face discrimination or misunderstanding within the Tokyo Ghoul universe due to being an outsider. For example, they could have a special weapon or training method that the local investigators haven't seen before.
Maybe the BTS members are humans in the Tokyo Ghoul world, but they are trying to find a way to co - exist with ghouls. They could start an underground movement to promote peace between the two species. This would involve a lot of action scenes where they have to face opposition from both humans and ghouls who don't believe in co - existence.
One idea could be a fanfic where a human character tries to form a peaceful co - existence pact with the ghouls. They might start by secretly helping a friendly ghoul and gradually work towards getting both sides to understand each other better.
You could add a young and naive ghoul who looks up to the Black Reaper as a mentor. This ghoul could be new to the world of ghouls and need guidance from the Black Reaper. Another potential character could be a mysterious old ghoul with vast knowledge of forgotten ghoul techniques. He could be an ally or an adversary depending on the situation. And a third character could be a human with psychic abilities who can sense the presence of ghouls. This human could befriend the Black Reaper or try to hunt him down.
One idea could be that the reader is a new ghoul in the area and Naki takes it upon himself to show them the ropes. Maybe he teaches them how to hunt without getting caught. Another plot could involve the reader being injured and Naki protecting them from other ghouls who might see them as easy prey. A third plot idea is that the reader has a special ability that Naki discovers and they team up to use it for their survival in the harsh ghoul world.
One idea could be exploring the Black Sea Reaper's origin story. Maybe it was once a normal fisherman who was cursed by a sea witch. Another could be a story where the Black Sea Reaper teams up with other sea creatures to fight a greater evil that threatens the Black Sea. A third idea might be a love story between the Black Sea Reaper and a mermaid from a different part of the ocean.
Some plot ideas for Tokyo Ghoul female OC fanfiction include her being an outcast among ghouls due to her different beliefs. Maybe she believes in non - violence and tries to spread this message, which goes against the traditional ways of many ghouls. Or, she could be on a quest to find out the truth about her transformation into a ghoul. Was it an accident, or was she targeted? This could lead her to uncover secrets about the ghoul world that have been long buried.
Maybe a story where a Tokyo Ghoul character gets transferred to the My Hero Academia universe. They could be mistaken for a villain at first because of their ghoul appearance, but then prove themselves to be an ally. For instance, Kaneki could use his kagune in unique ways during hero training exercises, impressing the teachers and students alike.