Perhaps the rookie travels to 12 different time periods for various reasons. It could be for adventure, to learn important skills from different eras, or to meet historical figures. For example, in one time period, he might meet a great scientist and gain knowledge that helps him in his own time.
It could be about a rookie who discovers a time - traveling device and uses it to correct past mistakes. Maybe he wants to save someone he lost in his real time.
Teamwork is also a big theme. The rookie 9 rely on each other in these time - travel scenarios. They need to combine their skills, whether it's combat skills or knowledge about different time periods, to overcome the challenges they face during their time - traveling adventures. For instance, in one story, one member has historical knowledge while another has the ability to fight off enemies, and they work together to survive in a dangerous past era.
The plot might involve Naruto being influenced by some external force. For example, a new enemy could be using some kind of mind - control or illusion on him to make him ignore the Rookie 9. Another possibility is that Naruto has become so focused on his training to become stronger that he starts to neglect his relationships with the Rookie 9, thinking that his power is more important for the future of the village.
By creating unique and diverse time - travel destinations. For instance, sending the rookie to prehistoric times to see dinosaurs, or to a future where technology has completely transformed society.
One common plot could be the Rookie 9 going back in time to prevent a major tragedy in the Naruto universe. For example, they might try to stop the Uchiha massacre. Another plot could involve them using their future knowledge to train better in the past and become stronger much earlier. They could also go back to change certain relationships, like Naruto trying to befriend Sasuke earlier to prevent his fall to the dark side.
The plot could center around Harry finding a mysterious spell that transports him to the 1940s. Once there, he discovers that the actions of a certain dark wizard in that era are linked to future threats he faced in his own time. So, he tries to stop this dark wizard's plans.
Perhaps the plot is centered around Hermione using time travel to save a loved one who was lost in a previous battle. She might have to navigate the complex rules of time travel, and along the way, discover secrets about the magic of time that no one knew before. This could lead to her having to make difficult choices between saving the past and protecting the present and future.
A possible plot could be that the Rookie 9 are adults during a time when a new threat emerges that is related to an event from Naruto's past. They have to use their combined skills and knowledge from their years of growth to combat it. For example, if it's a resurgence of an old enemy from the Third Hokage's era, they need to figure out how to stop it before it destroys the village.
One possible plot could be Naruto facing unexpected challenges during his rookie year that the original story didn't cover. For example, he might have to deal with a new group of enemies who are specifically targeting rookies. This would test his skills and his ability to adapt quickly.
One popular rookie 9 time travel fanfiction is 'The Rookie 9's Time - Travel Adventure'. It takes the characters on an exciting journey through different time periods. They face various challenges and meet historical figures along the way, which makes for a really engaging read.
In the fanfiction, the plot might start with Sam and Andy deciding they are ready for a baby. They start trying, and when they finally get pregnant, it's a time of great joy. However, as the due date approaches, Andy gets cold feet about how much their lives will change. Sam has to reassure her. After the birth, they find that their love for each other and for their baby is stronger than any fear, and they navigate the challenges of raising a child in the world of Rookie Blue.