One possible scenario in a Naruto - Kaneki fanfiction could be that Kaneki somehow ends up in the Naruto world. Maybe through a strange portal or some sort of jutsu gone wrong. He might initially struggle to adapt to the different environment and the presence of chakra. But his own unique kagune abilities could be seen as a strange new form of power in the Naruto universe.
Another idea is that Kaneki is brought to the Naruto world by Orochimaru. Orochimaru, being interested in Kaneki's unique physiology, wants to study him. Kaneki has to escape from Orochimaru's clutches and teams up with Naruto and his friends. Along the way, they discover that there are some dark secrets in the Naruto world that are related to Kaneki's past in a strange, unexpected way.
One great 'Kaneki x Reader Fanfiction' is 'A Meeting in the Dark'. It beautifully captures the complex relationship between Kaneki and the reader. The story has a great build - up of emotions and the descriptions of Kaneki's character are very accurate to the original source. Another interesting one is 'Our Unspoken Bond'. It delves deep into the unspoken connection that can exist between the two characters, with some really touching moments.
In some fanfictions, their love is often portrayed as a complex and somewhat tragic relationship. Given their nature as a ghoul and a half - ghoul in the Tokyo Ghoul story, there are often elements of danger and secrecy.
Well, an SSS rated Kaneki fanfiction might also be one that offers a fresh perspective on the Tokyo Ghoul universe. It could introduce new concepts or relationships related to Kaneki that are both believable and exciting. For example, if it creates a new type of bond between Kaneki and another character, whether it's a friendship or a rivalry, and explores that in a way that adds depth to the overall story. Also, the fanfiction should be well - edited with no major grammar or spelling mistakes, because those can really detract from the reading experience and prevent it from getting a high rating.
In a kaneki x tsukiyama lemon fanfiction, the story could be set in the dark and mysterious world they inhabit. Their relationship might be a bit of a forbidden love, given their different natures. The 'lemon' aspect would probably involve some intense emotional and physical interactions. It could show how they support each other through difficult times and how their love, with all its passion, evolves over the course of the story.
I would recommend 'A New Beginning for Kaneki and Hide' which can be found on Archive of Our Own. It has a unique take on their relationship, exploring what could happen if Hide had a more active role in Kaneki's transformation journey. It's full of emotional moments and great dialogue.
Good character portrayal is key. The way Kaneki's personality, his struggles, and his dual nature are depicted has to be on point. If the fanfiction can make the reader feel like they are really interacting with the Kaneki from the original story, it's a plus. Also, a strong plot that makes sense in the context of the world Kaneki exists in. For example, if it's set in the Tokyo Ghoul universe, the rules of that world should be followed.
If Kaneki turns into a baby in fanfiction, it could be a way to explore his character in a new light. Maybe he retains some of his memories from his previous form, but is unable to communicate them clearly. This could lead to a lot of misunderstandings and new adventures. Also, it could be a chance for the author to develop new relationships for Kaneki, as a baby he would be more vulnerable and dependent on others.
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.