Perhaps create a world where the stars are sentient and communicate with each other through a special language of light. A young star - child who is different from the others could be the main character, trying to find its place in this star - society.
One idea could be to explore the origin of the stars. Maybe in the fanfic, the stars are actually the souls of ancient beings. Another could be a love story set among the stars, where two star - like creatures fall in love while traversing the galaxy.
A time - travel plot in a Precure All Stars fanfic could be really cool. Maybe the Precure travel back in time to the origin of their powers and have to make sure that the events that led to their powers being created happen correctly. It could involve meeting their predecessors and learning about the true nature of their powers.
One idea could be a time - travel fanfic. A player from the present accidentally travels back in time to when the Division All Stars were first formed. He has to use his modern skills and knowledge to help the fledgling team. Another idea is a fanfic where the team gets an invitation to play in an alien tournament. They face strange opponents with unique abilities. It would be interesting to see how they adapt.
One idea could be a redemption arc for a previously disliked character. Maybe they team up with an unexpected ally and prove themselves in a series of challenges that are different from the ones in the show, like underwater maze races. Another could be a love triangle between three of the all - star contestants that causes drama both on and off the challenge field.
Perhaps a plot where the eliminated contestants decide to rebel against the rules of the Aftermath. They could form a group and try to change the way the show is run, demanding more fair treatment or better living conditions. This could lead to a lot of drama and conflict, as well as some interesting character interactions.
An interesting plot for a Total Drama All Stars OC fanfic could be an OC who is a master of disguise. They use this skill to trick other contestants in various challenges. For instance, in a mystery - solving challenge, they disguise themselves as different characters to gather information without being detected. Also, the OC could have a secret mission related to a family feud that dates back to a previous season's contestant, adding an extra layer of drama to the story.
One idea could be a fanfic that focuses on the backstories of the minor characters in 'Sea of Stars'. For example, exploring the life of a random villager before the main events of the game. Another could be a time - travel fanfic where the characters go back in time to change a crucial event in the game's history. Or a fanfic that imagines an alternate ending to the game, like the heroes failing in their mission and how the world would be different as a result.
Another interesting idea is to write a fanfic about Bloom Sky's origin story. How did they come to be? What were their early days like? This could involve exploring their families, their first experiences with magic, and how they met each other. It could be a long and detailed exploration of their backstories.
One idea could be a behind - the - scenes look at the friendships and rivalries among the stars in the 'house of stars'. For example, exploring how two actors who seem to be friends on the surface are actually competing for the same big role.
One idea could be exploring a different path for the main characters. For example, if they met under different circumstances, like at a different event or in a different kingdom. This could change the initial dynamic between them.
Perhaps a story where the cartoon all - stars are invited to a grand party in a different dimension. But things go wrong when a mysterious figure starts causing chaos at the party. They then have to work together to figure out who it is and stop them. This could involve a lot of comical misunderstandings and cool team - up moments.