One idea could be focusing on the new generation of ponies facing a magical mystery that threatens their homeland. They could go on a quest to find an ancient artifact to save the day.
Perhaps a story about the next gen ponies dealing with friendship challenges in a more modern - like Equestria. For example, new technologies that test their traditional values of friendship.
You could write about the next gen ponies having to interact with different species in a new way. They might have to form alliances with creatures they previously knew little about to overcome a common foe.
Some ideas in 'pokemon next gen fanfic' could be related to the evolution of existing Pokemon into completely new forms that are more powerful and have different appearances. There could be a focus on environmental issues in the Pokemon world, like certain Pokemon being endangered due to pollution or habitat destruction. Also, new items that can enhance Pokemon abilities in different ways, for example, an item that allows a Pokemon to temporarily change its type.
In a naruto next gen fanfic, you might consider having the new generation face a threat that is completely different from what the previous generation dealt with. It could be a new type of enemy that uses a form of jutsu that no one has ever seen before. This would force the young ninjas to think outside the box and develop new strategies. You could also explore their personal growth, like how a character who was initially shy and insecure becomes a strong and confident ninja through their experiences.
One idea could be focusing on the adventures of the next generation at Hogwarts. Maybe they discover a hidden chamber that has been long forgotten, filled with ancient spells and magical artifacts. Another could be a story about the new generation dealing with a new dark wizard threat, but this time they have to use their unique modern - day knowledge combined with magic to defeat it.
A really interesting concept would be to delve into the backstories of the new generation. What if some of them had secrets about their heritage that even they didn't know? Maybe one of them is related to a powerful but long - gone wizard from the past. This could add a whole new layer of mystery and drama to the fanfiction, as they uncover their true identities while also dealing with the typical Fairy Tail chaos.
One idea could be focusing on the children of Naruto and Hinata. Maybe their son has to deal with a new and powerful enemy that is targeting the Uzumaki clan. He could discover some long - lost jutsu that his father didn't know about and use it to defeat the foe.
Begin by thinking about the setting. Is it a new Equestria? Or maybe a place beyond what we know. Once you have the setting, introduce your characters and start building their relationships. For example, if your setting is a post - apocalyptic Equestria, how do the ponies interact with each other? What are their goals? You can also draw inspiration from the original MLP series, but put your own spin on it for the next gen.
Another interesting concept is to focus on how the next generation is different from the original ponies. Maybe they have new magical abilities or different social structures. You could write about a young pony who struggles to fit in because of these differences, but in the end, they use their uniqueness to make a positive impact on their community.
Maybe an OC who is from a foreign land outside of the main ninja villages. They come to the Hidden Leaf Village with a different set of skills and a different view on the ninja way. Their interactions with the established Next Gen characters, like Boruto and his friends, could create some really interesting storylines. For example, they might introduce new jutsu or training methods that are unheard of in the village.
Another concept might be the evolution of relationships. In MLP Next Generation fanfic, we could see how the relationships between different species in Equestria have changed over time. Maybe there are new friendships or rivalries between ponies, griffons, and other creatures.
One idea could be focusing on the children of the main BNHA characters dealing with new villains who have unique powers. They could struggle to live up to their parents' legacies while also finding their own identities.