A great plot could involve the sister forming an unexpected alliance. For example, she teams up with an old enemy of the Ninjago crew because they both have a common goal. This would create a lot of drama and interesting character interactions. She could also have a story arc where she discovers a long - lost relative during her adventures in the Ninjago world.
One idea could be exploring the sister's backstory in more detail. Maybe she had a special training or a hidden power that was only known to a few. Another could be a story where she gets separated from the main group and has to find her way back while facing her own personal demons.
Perhaps she could be the key to solving a major mystery in the Ninjago universe. The story could focus on her journey to uncover the truth behind a strange phenomenon that is affecting the balance of time. Along the way, she might have to make difficult choices that test her loyalty to her friends and her beliefs.
One idea could be exploring the backstories of the characters from the Hands of Time arc in more detail. For example, the relationship between Kai and Nya's parents before they disappeared. Another could be a time - travel adventure where the ninja go back further in time than in the original story to prevent an even greater threat.
She could be a new student at the ninja academy. She has big shoes to fill being Lloyd's sister. Some students are mean to her at first, thinking she'll get special treatment. But she proves herself by outperforming them in a difficult training exercise and earns their respect.
A fanfiction could focus on Nya's backstory as the sister in this context. It could show her growing up, her training, and how she came to be an important part of the ninja group during the 'Hands of Time' events. She might have had secret training sessions or a mentor that helped her become the strong character she is in the story. This could add depth to her character and the overall fanfiction.
One idea could be the ninjas traveling back in time to the very beginning of Ninjago's creation. They could witness the forging of the Golden Weapons and try to prevent an evil force from stealing them at that time. This would change the whole course of Ninjago's history and create a whole new set of challenges for the ninjas.
You could write a fanfiction where Aspheera accidentally releases an even more dangerous force while trying to regain her full power. The ninjas then have to work with her, despite their differences, to stop this new threat. This would involve a lot of character development for both the ninjas and Aspheera as they learn to trust each other.
In a Ninjago time travel fanfiction, the ninjas could be sent forward in time to a post - apocalyptic version of Ninjago. They would have to figure out what went wrong and then travel back to their own time to prevent it from happening. This could involve battles with future versions of their enemies who have evolved into even more dangerous foes.
The 'Hands of Time' plot should be incorporated. Maybe Nya has a special connection to the time - related elements in the story. She could be the one to figure out how to stop the time - related threats or unlock secrets related to the 'Hands of Time'.
A possible plot for this crossover fanfiction is that the worlds of Ninjago and Chima start to merge due to some magical mishap. This causes chaos as the different species and cultures collide. The heroes then have to figure out how to separate the worlds again. For example, the ninja from Ninjago might have to work with the lions from Chima. Another idea is that a group of villains from both worlds team up and the heroes have to form an alliance of their own. They would need to overcome their differences and learn from each other's fighting styles. There could also be a story where a Ninjago character is transported to Chima and discovers a long - lost relative from there, which adds a personal touch to the adventure.
One idea could be the next generation facing a new, more powerful enemy that combines the powers of all the previous villains. They'd have to learn from their parents' stories and develop new skills to defeat it.
One idea could be a time - travel plot where Lloyd and Nya are sent back in time to the early days of Ninjago. They have to work together to find a way back while also ensuring that they don't accidentally change the future. Another plot could involve them getting trapped in a mysterious realm and having to rely on each other's unique skills to escape. For example, Lloyd's elemental powers and Nya's water - based abilities.