She could experience the historical events of 1918 first - hand. It was a time of great change. There were things like the end of World War I and the start of the Spanish Flu pandemic. Bella would be in the middle of all that chaos or transformation.
Well, in the fanfiction world, she might also fall in love with someone from that era. Picture her dancing at an old - fashioned ball with a charming gentleman from 1918, and then a whole romantic story unfolds against the backdrop of that historical time.
She could meet soldiers coming back from World War I. These soldiers would have their own stories of war and survival, and Bella might be drawn into their tales.
She could change the future of the Cullen family. Maybe she stops a certain event from happening that would have led to their downfall in the original timeline.
In this fanfiction, perhaps Bella might reunite with old friends in Phoenix. She could revisit her favorite places there, like the local cafes or parks, and recall memories from her past. Maybe she'll meet someone new who has a connection to her old life in Phoenix.
She might meet some interesting characters from that era. Maybe she'll run into some early vampires or humans with unique stories. It could be a whole new adventure for her, different from her normal experiences in the present time in the Twilight universe.
He could meet his parents when they were young. Maybe he'd get to see his mother before she met his father and understand more about her life back then.
In some cases, it could be other time - traveling vampires or supernatural beings who have their own agendas. They might not want Bella to interfere with the past as it could disrupt their own plans or power bases. These antagonists could be more shadowy figures, working behind the scenes to thwart Bella's efforts.
Well, in this fanfiction, when Bella goes back to Phoenix, she could be on a journey of self - discovery. Since Phoenix was an important part of her past, it could be a place where she re - evaluates her relationships, especially those related to the events in Newmoon. For example, she might think about how her experiences in Forks have changed her and how her past in Phoenix still has an impact on who she is now. It could also be a place where she finds some sort of peace or answers to questions that have been bothering her since leaving Phoenix for Forks.
Well, he might change some crucial events. For example, he could prevent some villains from ever rising to power. Maybe he'd stop Frieza from destroying Planet Vegeta earlier, which would change the whole Saiyan history and his own life. He could also teach his past self some new techniques, making the Saiyans even stronger in that timeline.
In such a fanfiction, Goku might be seen as a very powerful and strange visitor in Konoha. He could start by showing off his amazing strength and speed during a training session with the ninja. Maybe he'd accidentally break some training equipment and leave everyone in awe.
One possibility is that Naruto enters an AU where chakra doesn't exist. Instead, there are other forms of power. He would have to learn how to use this new power from scratch. Also, the relationships between different ninja clans could be very different. Naruto might end up making new alliances and enemies based on this new dynamic. This could be a great opportunity for character development as he faces challenges that are completely different from what he's used to in his original world.