The fanfiction could revolve around the love that Ben and Kai have for each other growing even deeper during the pregnancy. Their relationship could transform as they are about to become parents.
Yes, there might be some. Fanfiction websites often have a wide variety of stories created by fans. You can try searching on popular fanfiction platforms like Archive of Our Own (AO3) or FanFiction.net. However, the availability depends on whether fans have been inspired to write such a story about Kai and Yuzuru.
One idea could be that Kai is cursed by an ancient evil spell. Maybe he was exploring an old, forbidden temple and accidentally triggered a trap that turned him into a snake. In this state, he has to learn to adapt to his new form. He might discover new abilities like slithering through small spaces undetected, which could be useful in his future battles against villains in Ninjago.
Kai could be anyone. It might be a reader who decided to rate a fanfic as 'M' for Mature. Maybe it's a username of someone within a particular fan community.
One possible fanfiction could be about how Ben and Kai discover they are going to be parents. Maybe it starts with Kai feeling unwell and they take a test. Ben is initially shocked but then becomes super excited about starting a family with Kai.
The rivalry - turned - friendship is also a big part. They start off as rivals in the Beyblade arena but gradually form a bond. In many fanfictions, this evolution is explored in detail, like how they learn to trust and rely on each other. Additionally, the challenges they face together, whether it's against a new enemy or dealing with internal team issues, play an important role.
The theme of redemption also appears. Cinder, with her past actions and the way she was treated, often finds redemption through her relationship with Kai. He helps her to see that she can be more than her past mistakes and that she has the potential to be a great force for good in their world.
One great Bonnie and Kai fanfiction is 'The Unlikely Bond'. It delves into how Kai's chaotic nature and Bonnie's powerful magic create an interesting dynamic. Their interactions are filled with tension and an underlying attraction that the author builds up really well.
One common theme is friendship development. Since they are two characters, often their relationship starts from some form of acquaintance and then grows into a deeper bond. Another theme could be adventure, where they go on quests together.