Well, Bloom going back in time in a fanfic could lead to some really interesting character interactions. She might meet her younger self and try to guide her. Maybe she'd also encounter some long - lost magical beings who could offer her new powers or knowledge. It would be a great opportunity to explore Bloom's character development in a whole new context.
One possibility is that she would have to readjust to the basic training and teamwork. She might find it both frustrating and nostalgic. Since she has more experience now, she could use her advanced knowledge to shine in the genin tasks, like acing the survival exercises. Also, her relationships with her old teammates, like Sasuke and Sakura, would take on a new dynamic as she tries to balance her new perspective with the naivete of being a genin again.
In the fanfic, Diaspro might initially be hostile towards Bloom because of some past jealousy or misunderstanding. But Bloom, being the kind - hearted character she is, could try to make peace. For example, Bloom could save Diaspro from a dangerous magical situation. This act of kindness could then lead to Diaspro having a change of heart and the two of them becoming tentative friends. There could also be a sub - plot where they have to work together to defeat a common enemy, which would further strengthen their new - found relationship.
In the 'Percy goes back in time fanfic', he may also meet his younger self. This could lead to some really interesting and confusing situations. He would have to be careful not to disrupt the timeline too much while still achieving whatever his goal is for going back in time.
Well, it could be that Bella goes back in time and she has to blend in with the society Elijah is in. She has to learn the customs and ways of that time period. Along the way, she finds out that Elijah has a different personality than she expected. He might be more carefree or more burdened by his family's history. As she tries to get closer to him, she has to deal with other vampires who are jealous of her attention towards Elijah. And they might plot against her, which adds more drama to the story.
One potential plot could be Bloom going back to the time when the first great war in the magical world happened. She could try to stop the war from starting, which would change the entire history of the magical world. This would also mean that the relationships between different magical species would be completely different in the present.
She could change the whole dynamic of Elijah's life. For instance, if Elijah was on a path of revenge in his original timeline, Bella might be able to show him a different way. She could introduce him to new ideas and values that were not present in his time. This could lead to a completely different version of Elijah, one who is more open - minded and less consumed by his past grudges.
It's possible that they would accidentally disrupt the timeline in the 'Harry and Teddy go back in time fanfic'. This could lead to all kinds of unforeseen consequences. They might create new threats or change the relationships between different characters in unexpected ways.
A great plot twist could be related to the time - travel itself. What if the way time - travel works in the WW2 era is different from how it is in Harry's time? This could lead to him getting stuck or being unable to use his magic properly. Or perhaps he discovers that a certain event in WW2 was actually caused by a wizard from the future (not just him) who was trying to correct something in the wizarding world's past. His attempts to fix things could then make the situation even more complicated as he unknowingly steps on the toes of a much larger time - traveling plan.
One possible main plot twist could be that they go back to a time when the Uchiha clan was not yet massacred. Sasuke might have the chance to prevent it, but this could have unforeseen consequences. For example, it could disrupt the balance of power in the ninja world at that time. Another plot twist could be that they go back to a time when Naruto's parents were alive. Naruto might get to meet them and learn from them directly, which would change his understanding of his own identity and power. A third plot twist could be that they find out that their time - traveling was actually part of a grand scheme by an ancient and powerful enemy, who wants to use their presence in the past to change the future in a way that benefits them.
They might visit a hidden magical spring during Spring Break. Sky could be showing Bloom all the secrets he knows about the place. It would be a time for them to relax and enjoy each other's company away from the chaos of school and battles.