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.
Kaneki and Touka could be in a situation where they have to team up with some former enemies to save the ghoul community from a new threat. This would test their ability to forgive and their leadership skills within the community.
A fanfic could focus on Rize teaching Kaneki how to fully embrace his ghoul side. She could show him how to use his powers more effectively and how to hunt without attracting too much attention. In return, Kaneki could teach Rize about human emotions and values, which she might have lost touch with over the years of being a ghoul. This exchange could lead to a deep bond between them.
One possible fanfiction could focus on Kaneki and Touka building a life together after the chaos in Tokyo. They might start a small coffee shop where they can interact with both ghouls and humans in a more peaceful way. This could be a symbol of their hope for a harmonious co - existence between the two species.
Many Kaneki x Tsukiyama fanfics also tend to be set in the dark and gritty world of Tokyo Ghoul. The setting adds to the overall atmosphere of the relationship. The fanfics might include elements like their interactions within the ghoul society, their battles together or against each other, and how these experiences shape their relationship. For example, a fanfic could show how they bond over a shared enemy or a difficult situation in the ghoul underworld.
One possible fanfic could be about how Rize and Kaneki's relationship evolves in a world where they manage to overcome their differences. Maybe they start to understand each other's pain and loneliness, which were deeply rooted in their ghoul and half - ghoul existences respectively.