There are also those where Tracey, who was Ash's friend in the anime, could be turned into a rival in fanfiction. Maybe he has a change of heart or has some new motivation that pits him against Ash. Also, characters like Gladion from the Alola region can be used as rivals in these stories as they have strong Pokemon and unique personalities.
Blue is a very common side character. He and Red have a long - standing rivalry which often plays out in the fanfiction. Green is also seen a lot, sometimes as a friend or a rival. Professor Oak is another common side character, often providing advice or information to Red.
One possible rival could be a cocky young trainer named Max who thinks he's better than both Ash and Giselle. He always tries to one - up them in Pokemon battles. Another rival could be an experienced trainer named Lily. She has a collection of rare Pokemon and is constantly challenging Ash and Giselle to prove her superiority. There could also be a team of two rivals, Jack and Jill. They work together to try and outwit Ash and Giselle in any Pokemon - related competition.
Well, often you'll see themes related to Ash's growth. Now that he's a champion, he has to grow even more as a trainer and a person. Also, there's the theme of legacy. He has to think about how he wants to be remembered as a champion. Additionally, some fanfictions explore how his Pokemon feel about his new status and how it affects their training and relationship with him.
It could be a local Kalos trainer who has been training specifically to become the Kalos champion for years. This trainer might have a team of rare and powerful Kalos Pokémon and a very strategic battle style. He or she could see Ash as an outsider and a threat to their long - held dream of being the champion.
In some 'pokemon champion ash fanfiction', Gary could be an important character. He has always had a competitive relationship with Ash, so in stories where Ash is a champion, Gary might try to challenge him or be involved in some sort of plot related to Ash's championship. Another character could be Serena, especially if the fanfiction focuses on the romantic aspect of Ash's life along with his championship journey.
Maybe Team Rocket could have a new member who is a ninja. This new member could be Ash's main rival. They would try to steal Ash's pokemon in more sneaky and ninja - like ways. And Ash would have to use his ninja skills to protect his pokemon and defeat this new rival from Team Rocket.
Ash is of course a very common character as he is the central figure. Pikachu is also often included as it is Ash's most well - known Pokémon. Other characters like Misty and Brock might also make appearances as they are Ash's friends and travel companions in the original Pokémon series.
Ash is obviously the central character. Then there are the female characters from the Alola region that often form his harem. Lillie is a very common one. She has a gentle and kind personality and her relationship with Ash can be explored in many ways in the fanfictions. Another is Mallow. Her love for cooking and her energetic nature make her an interesting character to include in the harem. And there's also Lana, with her love for water - type Pokemon.
Obviously, Ash is a central character. Pikachu is also often there, as it's Ash's main Pokemon. Misty and Brock might be in the fanfiction too, trying to figure out what has happened to Ash and how to stop his evil ways. Sometimes, Gary Oak could be involved, either as an antagonist to Ash's new evil self or as someone trying to help bring him back to the good side.
Obviously, Ash is a common character. His friends like Brock and Misty might also make appearances. They could offer their own skills and knowledge to help Ash in his ranger adventures.