There are also often appearances from various Gym Leaders. They can serve as either allies or rivals to Ash. For instance, a Gym Leader might challenge Ash to a battle to test his newfound power, or they could join forces with him to take on a greater evil that threatens the Pokemon world.
One common theme is power - making Ash more powerful than in the original series. This can be through new training methods or special Pokemon he gets.
Lance, the dragon - type master, could be a powerful and mysterious character in the fanfiction. His skills and knowledge of powerful Pokemon could either help or hinder Ash and Red. And then there's Pikachu, of course. Pikachu is Ash's most loyal partner and could have some really cute and exciting interactions with Red's Pokemon, like when they play together or team up in battles.
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.
Gary Oak could be an interesting addition. His rivalry with Ash is well - known, and his skills as a Pokemon trainer would make him a valuable character. Then there's Blue, who has a connection to Red. His different approach to Pokemon training compared to Ash and Red could create some interesting storylines. And don't forget about Professor Oak. He could provide guidance and knowledge to both Ash and Red, and his presence always adds a sense of wisdom to the Pokemon world.
One popular 'badass Ash' Pokemon fanfiction is 'A New Beginning for Ash'. In this fic, Ash returns to Kanto with newfound skills and a more assertive attitude, taking on challenges in a whole new way. He has some epic battles against gym leaders who are also much stronger than in the original story.
One interesting plotline could be Ash becoming a super powerful trainer overnight in the fanfiction. Maybe he discovers a new type of Pokemon power that gives him an edge in battles.
Often, the mentor - like characters can be really interesting. They could be an old wizard or a wise hermit who takes Ash under their wing and guides him. Another interesting character might be the antagonist, the person or force that stands in Ash's way as he tries to reach his goals. And sometimes, there are sidekick characters who have their own quirks and add humor to the story.
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.
Ash is obviously a very common character as the title includes his name. Pikachu, his trusty partner, is also likely to be there. His friends like Brock and Misty often appear as well. They might support Ash during his league journey or have their own sub - plots related to the league.