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.
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.
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.
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.
Her friends, like Damon and Stefan, might come to her rescue. They are often the ones to jump into action when one of their own is in danger.
In Kidnaped Izuku Fanfiction, likely antagonists could be rival villains who see Izuku as a threat to their plans. For example, those who want to stop him from becoming a great hero. It could also be villains who are after his unique quirk. Maybe they want to study it or use it for their own evil purposes. Another possibility is that it could be a group with a vendetta against the hero school he attends, and they target Izuku to send a message.
The Akatsuki could also be antagonists in an Iruka kidnapped fanfiction. They might believe that Iruka has some information about the jinchuriki, especially since he is close to Naruto. Or there could be a new, made - up antagonist in the fanfiction, like a powerful dark wizard who has set his sights on Iruka for some unknown but sinister reason. This new antagonist could add a fresh and unique element to the story.
It could be the traditional villains from the original story, like the Titans or some powerful monsters. They might torture Percy to get information or just to cause chaos.
Well, it could be Orochimaru. He was always up to no good and had an interest in powerful ninja. He might target Naruto and Temari to either steal their powers or use them for his evil experiments, which would surely lead to them getting hurt.
There might be some new characters introduced in the fanfiction who have different ideals or motives that clash with Annabeth's. These new characters could be the antagonists as they oppose Annabeth, and Percy has to step in. For example, if they think Annabeth's way of handling a certain quest is wrong and Percy believes in her, he'll fight against their ideas.
One possible antagonist could be a rogue ninja from another village. They might target Tenten for her unique weapon - handling skills, thinking they can use her to create powerful weapons for themselves. Naruto would then have to face this ninja to save Tenten.