Giovanni is usually a main character. He's the leader of Team Rocket and in the Rainbow Rocket scenario, he's a central figure. Lysandre from Team Flare could also be a main character. His extreme views and his connection to the Rainbow Rocket's overall plan make him important. And of course, the protagonist of the fanfic, who could be a young trainer trying to stop their evil plans.
One idea could be exploring the backstories of the Rainbow Rocket members in more detail. For example, Giovanni's motives and how he assembled the team. Another could be a scenario where the protagonist has to infiltrate the Rainbow Rocket base. Maybe they have to find a way to stop a new, more powerful weapon the team is developing.
The main characters might not only be human trainers. Some Pokemon could take on leading roles. For example, a powerful and wise Charizard could be a main character. It might have been trained by a famous trainer in the past but now fights independently against Team Rocket. There could also be a group of Eeveelutions that are the main focus. They have different abilities and personalities, and together they form a force to be reckoned with against Team Rocket. Alongside them, there could be a trainer who acts as a guide or coordinator for their efforts.
I'm not entirely sure as it can vary from one 'the rainbow factory fanfic' to another. But often, there could be a factory owner or manager who is in charge of the rainbow - making process. There might also be workers in the factory, some of whom could be the main characters if the story focuses on their experiences or their discovery of the secrets within the factory.
Maybe the main characters are a group of outcasts. They find unity and purpose in their exploration of the silver rainbow. Each character could bring a different skill or perspective to the group, making their interactions and development throughout the fanfic quite engaging.
Maybe there is a young protagonist who is on a quest. This character could be deeply affected by the sight of a rainbow at a crucial moment in their life and that sets them on a path of adventure or self - improvement. There could also be an older character who serves as a guide or mentor, and their relationship with the younger character is intertwined with the rainbow symbolism.
I'm not sure specifically who the main characters are in Rocket Academy Fanfiction as it depends on the individual stories written by fans. But it could be students, teachers, or even administrative staff within the Rocket Academy.
I'm not sure who the main characters are in the 'rocket boys story' without more context. It could be a group of young boys who are friends and share a love for rockets.
I'm not sure exactly who the main characters are in 'rocket boys novel' without reading it. But I guess they would be the boys who are interested in rockets.
It could be a young and ambitious trainer. This trainer is often the one who drives the story forward, seeking out Fatalis for various reasons like proving their worth or to protect their region.
It's hard to say exactly who the main characters would be without reading the specific 'pokemon titan fanfic'. But it could be a young and brave trainer who is determined to face these titan Pokemon. Maybe there's also a wise old Pokemon professor who provides guidance on dealing with them.