There's 'Unlikely Allies' which is a great 'kaneki ken x hinami fanfiction'. It delves into how they support each other during difficult times. The story is full of emotional moments and their interactions are very well - written.
One common theme could be the exploration of their relationship dynamics. Since they are both characters from Tokyo Ghoul, their different personalities and experiences within the Tokyo Ghoul universe might be explored.
One common theme is the complex relationship between them. Given their different personalities and the nature of their characters in the Tokyo Ghoul universe, a lot of fanfictions explore how they interact, whether it's in a friendly, antagonistic, or more romantic way.
One common theme is identity. Since it's a female version of Kaneki Ken, the fanfiction often explores how her gender affects her identity as a ghoul. Another theme is relationships. There are different takes on how she interacts with other characters like Touka or Hide.
One popular 'kaneki ken fanfiction' story could be those that explore his transformation in more depth. For example, some might focus on his mental state during the different stages of becoming a ghoul. Another could be about his relationships with other characters like Touka, showing their interactions in new and different scenarios that weren't fully explored in the original work.
It's likely that in this fanfiction, the author wants to take Kaneki Ken's character and put a new spin on it by making him a baby. Maybe it's a way to show how his character might have developed from such an early stage. It could also involve other characters from the series interacting with baby Kaneki in interesting ways, like how they might protect or care for him.
A common theme is romance. Since Ken Kaneki is a complex and interesting character, many female - authored fanfictions explore a romantic relationship between a female character and him. Another theme is friendship. Female characters might form deep friendships with Ken Kaneki and support him through his struggles. Also, self - discovery is often there. Ken Kaneki's own journey of finding out who he is as a half - ghoul can be paralleled with a female character's journey in some fanfictions.
You can try websites like Archive of Our Own (AO3). It has a large collection of fanfictions from various fandoms, including Tokyo Ghoul where Tsukiyama Shuu and Kaneki Ken are from. Another option could be Fanfiction.net, although the quality may vary more there.