One option could be a trainer who was once disqualified from a major Pokemon event due to false accusations. He has since then trained even harder and now enters the 'Game of Champions' to clear his name. His Pokemon are all very loyal to him because they know the truth. Or a trainer who has a unique way of training Pokemon, like using music or art to communicate with them. This makes his Pokemon stand out in the 'Game of Champions' and he becomes a popular figure among the other trainers.
A determined young trainer from a small town who has always dreamed of making it big in the Pokemon world could be a main character. He starts with a common Pokemon but through hard work and training, it becomes very powerful. Another could be a mysterious trainer who always wears a cloak and has a team of rare and powerful Pokemon that no one has ever seen before.
It could be the trainers who have the strongest Pokémon. For example, a young and determined trainer who has been training hard for the championship.
The main antagonist could be a powerful trainer who has been banned from official Pokemon leagues for using underhanded tactics. In the Game of Champions, he sees an opportunity to regain his reputation and will stop at nothing to win. He uses his knowledge of Pokemon psychology to manipulate his opponents' Pokemon during battles.
It could be an underdog trainer who has been training hard in the shadows and finally gets the chance to participate in this exclusive event.
In addition to the well - known champions, there could be some new or lesser - known champions. Maybe a champion from a newly discovered region that has unique Pokemon. They would bring in a fresh perspective and different training methods. Also, some retired champions might come back to help the current ones. They could have a wealth of experience and wisdom that the younger champions lack. These characters would all interact, share their stories, and work together towards a common goal in the fanfic.
A young inventor - trainer. This character is constantly modifying Pokeballs to give their Pokemon unique advantages in battles. For example, a Pokeball that releases a small burst of energy to boost their Pokemon's first attack in a battle. They enter the Champions League with their homemade gadgets and their trusty Pikachu, which they have trained to use electric attacks in new and creative ways.
A young prodigy who has been training for the game since childhood. He has natural talent but also has to learn how to deal with the pressure of being a top contender.
Well, it could be about epic battles among Pokémon trainers in a champion - like setting. Maybe it features intense Pokémon battles, the rise of a new champion, and all kinds of Pokémon with unique abilities coming together in a fictional story.
Maybe an underdog trainer who has been training in secret and decides to enter the 'champion of champions' competition to prove themselves. This character could have a unique bond with their Pokemon that gives them an edge in battles.
It could be an underdog character. Maybe a young boy or girl who has always dreamed of being a champion but lacks the natural talent. However, through hard work and determination, they start to make a name for themselves in the game.
The main character could be a young and fearless fighter named Kai. He has been training all his life for the 'game of champions' and has a natural talent for combat. He is determined to prove himself and win the championship.