Another potential kidnapper could be a jealous rival ninja from another dojo. They might envy Kai's position in the ninja team and his popularity. So, they kidnap him to prove that they are better and to try and take his place among the main ninjas.
If Kai is kidnapped in a fanfiction, it could be that the kidnappers are after his power of fire. They might try to extract it from him or use him as a bargaining chip against the other ninjas. The story could then revolve around how Kai resists their attempts while waiting for his friends to save him.
Another potential kidnapper could be a new villain that we haven't seen in the official Ninjago series yet. A fanfiction gives the writer the freedom to create a whole new antagonist who has a special grudge against Lloyd or wants something that only Lloyd can provide.
Perhaps a fanfiction where the female Kai gets transported to an alternate dimension. In this dimension, she meets different versions of the ninjago characters. She has to find a way to get back home while also learning valuable lessons about herself and her powers. This could involve her facing challenges that the male Kai may not have faced in the original story.
In Lego Ninjago Kai x Cole fanfiction, their relationship can be explored in many ways. It could be a deep friendship that overcomes challenges. For example, they might support each other during tough battles against the forces of evil. Their different personalities, Kai's hot - headedness and Cole's more calm and collected nature, can create interesting dynamics.
When writing a fanfiction for female Kai in Lego Ninjago, start with a strong hook. Maybe it's a mysterious event that only she can solve. Then, build her character arc. She could start as an overconfident newbie and grow into a more humble and powerful ninja. Include details about her appearance, like her unique ninja suit design. Also, think about the setting. You could set the story in a new part of Ninjago, like a hidden village in the mountains, which would add more depth and intrigue to the story.
It could be an old enemy of Keith's, someone from his past who has a vendetta against him. Maybe a former rival from his days in the military academy who has now turned to more devious means.
In some creative fanfiction, it could be an alternate version of Spiderman himself from a different dimension. This Spiderman has gone bad and kidnaps a fan from our dimension as part of some grand, dark plan that involves crossing dimensions and causing chaos.
A power - hungry nobleman from a neighboring land could be the kidnapper. He might believe that by having Rapunzel in his possession, he can gain some sort of political advantage or use her as a bargaining chip against her kingdom.
It could be Orochimaru. He's always been interested in obtaining powerful individuals for his experiments, and Naruko with her unique abilities would be a prime target.
It could be a new villain that has emerged, someone who is jealous of Gohan's power and wants to make it his own. This villain might be from a far - off planet and has heard of the Saiyan legend.