One idea could be to have a character from a magical anime suddenly appear in a normal high school in real life. For example, a character like Naruto with his unique abilities would create a lot of chaos and also interesting friendships in a modern school setting.
One idea could be a fanfic that combines different anime universes. For example, characters from 'Naruto' and 'One Piece' team up to face a common enemy. Another could be a fanfic focused on the daily lives of minor characters in a popular anime. It gives a new perspective on the anime world.
One idea could be to have a tournament where characters from different anime universes compete. For example, you could have Goku from 'Dragon Ball' against Naruto from 'Naruto'. Another idea is to make the tournament have unique rules, like battles taking place in different dimensions. You could also include some underrated anime characters to give them more spotlight.
One interesting plot idea could be about a group of modern - day people suddenly finding themselves in a world similar to that of Attack on Titan. They have to quickly learn the skills of survival, like using the 3D maneuver gear which they discover in an abandoned military base. Another could be a fanfic where the Titans exist in a parallel modern world, and a secret organization has been fighting them in the shadows all along.
One idea could be a story where a character discovers a magical power within their belly button. For example, in an anime - inspired world, a young girl notices a strange glow coming from her belly button one day. This leads her on an adventure to figure out the origin of this power and how it relates to the overall story of the anime world she lives in.
One idea could be to have characters from different popular anime shows come together for a square dance competition in a magical anime - themed world. They could use their unique powers and abilities during the dance, like a character with teleportation powers popping in and out during the formations.
One idea could be Naruto living in a modern city and trying to find a job. He might use his ninja skills in unexpected ways, like using his speed to be a delivery person. Another could be Naruto going to a normal school and having to deal with bullies, but then using his ninja training to stand up for himself and others.
One idea could be to have the main characters from the anime and manga meet in a new region. For example, Ash from the anime could encounter Red from the manga. They could team up to face a powerful new villain that neither has faced before. Another idea is to explore how the different Pokemon-catching mechanics in the anime and manga could interact. Maybe the Pokeballs in the manga have a different effect in the anime world.
One idea could be to cross it over with a popular RPG world. The characters from 'No Game No Life' could enter a world full of quests, magic spells, and different races like elves and dwarves. They would use their gaming skills to navigate this new world.
One idea could be a character moving to a new city after a big break - up. They start fresh, make new friends, and find a new job that they love. It's a classic way to begin a new life in a fanfic.
One idea could be a fanfic where the legendary Pokemon have human-like lives in a secret society. They deal with normal problems like friendship, rivalry, and finding their place in the world, all while hiding their true identities from humans.