One idea could be a quest to find all the Chaos Emeralds in a post - apocalyptic world where the power of the emeralds is the key to restoring order. Another could be a story where a new character discovers they have a special connection to the Chaos Emerald Z and must learn to control its power to defeat an ancient evil.
One idea could be exploring the backstories of the characters in more depth. For example, delving into their past relationships, traumas, or what led them to be in the situation during the Emerald Twilight. Another could be a 'what if' scenario, like what if a different character had made a crucial decision during that time. Maybe a fanfic where a minor character steps up and changes the course of events.
Another interesting plot could be that the main character's Pokemon start to develop strange behaviors. It turns out that there is a mysterious force in the region that is affecting their minds. The character has to embark on a journey to find the source of this force and stop it before it causes chaos among all Pokemon.
There could be a human scientist as the main character. This scientist is researching the Chaos Emerald Z and accidentally activates some of its powers. Now, they have to deal with the consequences, like strange creatures emerging from other dimensions due to the emerald's energy. They would have to use their scientific knowledge along with the help of some new - found friends to control the situation.
One interesting plot idea could be a new and powerful villain emerging in the 'naruto of chaos fanfic' world. This villain could have a unique ability that challenges Naruto and his friends in ways they've never faced before.
One idea could be exploring the backstory of a minor character in the 'chaos walking' universe. For example, a sidekick who has some hidden powers or a past connection to the main antagonist. Another plot could be a time - travel scenario where a character goes back in time to change a crucial event in the 'chaos walking' story, which then has a ripple effect on the entire world. Maybe also a plot where the characters find a new planet that has a completely different form of the 'noise' and they have to adapt to it.
You could also do a time - travel fanfic within the Chaos Trilogy universe. A character goes back in time to try and prevent a major catastrophe that happened in the original trilogy. This would involve them having to interact with their past selves and deal with the consequences of changing the past.
A great plot could involve a Pokemon that has the ability to travel between the Emerald and Ruby regions at will, causing chaos as it steals rare items. The fanfic could follow the journey of two trainers, one from each region, as they try to track down this Pokemon and return the items. They start off as rivals but gradually learn to work together. The different landscapes and Pokemon of the two regions would add a lot of variety to the story.
The plot could revolve around a new character who arrives in Remnant with a Chaos Emerald. This character is being chased by an unknown force from another dimension. The RWBY team decides to help the new character protect the emerald. As they do, they learn about the different abilities of the emerald. For example, it can open portals to other dimensions. They have to fight off the pursuers while also dealing with the temptation of using the emerald's power for their own gain.
One idea could be a crossover where Naruto and Goku team up to fight a common enemy. Maybe an evil force that combines the power - stealing abilities of Orochimaru and the planet - destroying might of Frieza. They would have to learn from each other's fighting styles and powers.
Maybe a story where the Powerpunk Girls Z lose their powers temporarily. They then have to rely on their wits and teamwork more than ever. They could start training in new ways, discover hidden strengths within themselves, and in the process, also learn more about the origin of their powers and how to get them back.