You could also create an alternate timeline for the 'a new dawn' story. Maybe in this new timeline, a key decision was made differently, and it completely changes the course of events. This would allow for a lot of creative freedom in exploring new relationships and plot developments.
Another interesting concept is to write a 'a new dawn fanfic' from the perspective of an antagonist. Often, we see stories from the hero's point of view. By writing from the antagonist's side, we can understand their motives and perhaps make the readers sympathize with them in unexpected ways.
One idea could be exploring a character's backstory that was not fully developed in the original. For example, if there's a side character in 'a new dawn', the fanfiction could delve deep into their past, like their family life or how they came to be in the setting of the story.
A great Ash meets Dawn fanfic idea could be set in a post - apocalyptic Pokemon world. Ash and Dawn find each other in the chaos and have to rely on their Pokemon and each other to survive. They could also travel through time and meet their younger selves, which would lead to some really interesting character development. Maybe they are on a quest to find a legendary Pokemon that can restore the world to its former glory.
One idea could be to focus on a young recruit's journey through the war. Show their initial fear and inexperience, and how they grow into a capable warrior. For example, they might start out being afraid of the chaos demons but learn to face them bravely.
In this fanfiction, a really interesting plot might be the emergence of a powerful energy source near a stargate. This energy source attracts various factions, both friendly and hostile. The main characters then have to protect it from falling into the wrong hands, while also trying to understand its true nature. They might face internal conflicts within their own group as different members have different ideas on how to handle this new discovery. And there could be a race against time as the hostile forces are getting closer and closer to seizing the energy source.
Perhaps a plot where an old enemy resurfaces in a new form, and the new generation has to figure out their weaknesses. This could lead to intense battles and character development as they struggle to adapt to this new threat.
One interesting plot idea could be Ash and Dawn teaming up to explore a new, uncharted region in the Pokemon world. They could encounter rare and unique Pokemon species that are not known to the rest of the world. Another idea is that they participate in a special tournament where the rules are very different from the regular Pokemon battles, like battles on floating platforms or with certain type restrictions. A third plot could be that they discover a mystery related to an ancient Pokemon civilization and have to solve it to save the present - day Pokemon world from some kind of threat.
One idea could be exploring Aloy's life before she became the Seeker. Maybe she had a secret friendship with another outcast in her tribe. Another plot could involve a new threat emerging that is related to the old world's technology but in a way Aloy has never seen before. And perhaps a story about Aloy trying to understand the true origin of the machines beyond what she already knows.
One plot idea could be Dawn's struggle with her newfound weight in the Pokemon world. Maybe she has trouble keeping up with her Pokemon during battles or travels. Another could be a story where her Pokemon help her come to terms with her body and gain confidence.
One idea could be that Dawn and Barry team up for a special Pokemon tournament. They train together, sharing their unique training methods. Dawn might teach Barry about the importance of bond with Pokemon, while Barry shows Dawn some new battle strategies.
For a 'Breaking Dawn Edward POV fanfic', you might consider his feelings about leaving Forks. He has such a strong connection to the place, and now with a new family member and Bella's transformation, he has to make the decision. You could write about his nostalgic moments, his hopes for the future in a new place, and how he deals with saying goodbye to the familiar. His conversations with Bella about this in his mind could add a lot of depth to the story.