Surviving in the ghoul world as a male OC reborn into Tokyo Ghoul fanfiction would be tough due to the lack of a support system. In this cruel world, having someone to rely on can mean the difference between life and death. Without any pre - existing relationships or allies, the OC would have to build them from scratch. This would involve trusting strangers in a world where trust is a luxury. He would also have to learn the unspoken rules and politics among ghouls very quickly to avoid making enemies unknowingly.
One possible plot could be that the oc is reborn as a ghoul in the Tokyo Ghoul world. They struggle to come to terms with their new identity and the need to feed on human flesh. They could try to find a way to co - exist with humans without causing harm, perhaps by joining Anteiku and learning from Kaneki and the others.
The main antagonist could be a powerful Aogiri Tree member. They might see the oc as a threat to their plans of overthrowing the CCG and taking over the Tokyo Ghoul world. This antagonist could constantly send other ghouls to attack the oc, trying to either kill or convert them to their side.
Well, he might gain special abilities by undergoing some sort of extreme physical or emotional trauma. In the story, Kaneki's transformation into a more powerful ghoul was partly due to the torture he endured. The male OC could experience something similar, which could trigger a latent power within him. Additionally, he could study ancient ghoul lore. There might be secrets hidden in the past of ghouls that could unlock new powers if he discovers and applies them.
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.
Another aspect could be his relationships. He might have a complicated friendship with a human who is aware of his ghoul nature. This relationship could be full of tension, as they both try to navigate the dangerous world where ghouls and humans are at odds.
A good plot also involves character growth. Have your male OC start as a naive ghoul and through his experiences, he becomes more cunning and powerful. This transformation can be the heart of the fanfiction, as readers watch him overcome obstacles and change for the better.
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 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.