Well, often there's the theme of family. In these fanfictions, Bonnie and Kai might be building a new kind of family with the baby. Another theme could be growth. Both characters could grow as individuals as they take on the responsibilities related to the baby. For example, Kai might become more empathetic and Bonnie might become more assertive in making decisions for the family.
Some common themes could be love and protection. Since it involves a baby, the idea of protecting the innocent life might be prominent. Also, the relationship between Bonnie and Kai could be explored in the context of this new addition to their 'world' in the fanfiction, like how they adjust to being parents or caretakers.
Well, there could be a fanfiction where Kai and Bonnie's baby is a key to saving their world. The story might focus on how they protect the baby from those who want to use its power. It could also involve other characters from their universe helping them in this task.
One common theme is redemption. Kai is often a complex and somewhat villainous character, and many fanfics explore Bonnie's role in redeeming him. Another theme is the power of love. Their relationship is often depicted as being able to overcome differences and obstacles. For example, in many fanfics, their love helps Kai to resist his darker impulses.
Love and relationship growth is likely to be a common theme. The presence of a baby can put a strain or strengthen their relationship, and fanfictions might explore how they navigate this new situation together. Also, themes of protection might be present as they would want to keep the baby safe in the fictional world.
One common theme could be Kai's early days of discovery. Maybe he's just starting to show his fiery nature as a baby. Another theme might be his relationship with his family in this baby version. It could explore how his parents or siblings interacted with him. Also, it could focus on his potential as a future ninja even at such a young age.
When writing a Kai and Bonnie baby fanfiction, it's important to set the right tone. Since they are from a magical world, you can use that to your advantage. Describe the world they are raising their baby in, whether it's a spooky place like Kai might be used to or a more nature - filled place like Bonnie might prefer. Also, think about the baby's character. Will it be a troublemaker or a calm child? Build the story around these elements.
It could be other supernatural beings who might see the baby as a threat or a powerful tool. Maybe some dark witches or warlocks who want to use the baby's power for their own evil purposes.
A common theme is the exploration of their different natures. The withered Bonnie having a more worn - out and perhaps darker past, while the toy Bonnie is newer and more innocent. Some stories also revolve around their cooperation to face threats in the FNAF world.
One popular theme is redemption. Kai is often a character in need of redemption, and in many fanfictions, Bonnie becomes the catalyst for that change. Their relationship is explored in the context of Kai trying to make up for his past misdeeds.
Often, there is a theme of secrecy and forbidden love. Since they are both characters in a somewhat dark and spooky game setting, their relationship might be seen as something that has to be hidden from others. This adds an element of tension and drama to the fanfiction, as they have to navigate their feelings while also dealing with the external threats and mysteries of the FNAF world.
Another theme is the protection of the unborn child. Given the dangerous supernatural world they live in, both Bonnie and Klaus are usually depicted as being extremely protective. They will go to great lengths to keep their baby safe from all the threats out there.