The Magma Child is obviously one of the main characters. There might also be a mentor figure, perhaps an older Pokemon trainer who has some knowledge about the Magma Child's powers. And of course, their Pokemon, which could include popular fire - type like Charizard or Arcanine.
One of the most memorable characters could be the rival trainer. They often push the Magma Kid to become better. Another is the wise old Pokemon professor who gives the Magma Kid advice and guidance. And there's the leader of the opposing team, like the leader of Team Aqua if it's a story that involves that rivalry. They add conflict and drama.
One interesting story could be about a Magma Child's journey to discover their unique powers. Maybe they start off in a small town near a volcano and gradually realize they have an affinity for fire - type Pokemon and can communicate with them in a special way.
Maxie is definitely one of the most iconic. As the leader of Team Magma, he drives the team's goals and actions. His strong beliefs in expanding the land for the benefit of humans and Pokemon make him a central figure in any Team Magma fanfiction.
Archie from Team Aqua is often quite popular. His strong leadership and his extreme views on expanding the ocean make him a complex and interesting character in fanfiction. Writers can explore his motives and what led him to form Team Aqua.
Some of the grunt characters can also be popular in fanfiction. They may not have as much power as the leaders, but their loyalty to their respective teams and their simple yet relatable goals can make for interesting side stories. For example, a Magma grunt who is just in it for the adventure and slowly realizes the potential harm of his team's actions.
Obviously, the Magma Daughter herself is very popular. Also, characters like the Pokemon she teams up with, such as a strong Torchic or a sly Zubat. The rival trainers who oppose her in her journey can also be quite popular.
Obviously, the main character could be the new Magma Grunt. He could be a fresh recruit with a different perspective compared to the more experienced members of the team.
Maxie from Team Magma is often a popular choice. His strong leadership and his extreme beliefs about expanding the land for Pokemon make him an interesting character to explore. Writers can delve into his motives and what led him to such radical ideas.
One common theme is power. Team Magma is often obsessed with power, whether it's through controlling powerful Pokemon or seeking ancient artifacts. So, many fanfictions explore this pursuit of power and its consequences.
I really like the fanfiction 'Maxie's Redemption'. In this story, Maxie realizes the error of his ways after the events with Team Magma. It's a great character study of Maxie and how he tries to make amends in a world full of Pokemon.