The gym leaders are also quite popular. For instance, Brock and Misty. In fanfics, they can be portrayed in different ways. Maybe Brock has a secret mission related to the Pokemon in his gym, or Misty has a special connection to a certain type of Water - type Pokemon that is explored in the fanfic story.
Ash Ketchum is also very popular. He is the main character in the Pokemon anime series that is based on the Red, Blue, Green and Yellow games. Fanfics often explore different versions of his journey, like what if he made different choices during his Pokemon battles or when choosing which Pokemon to catch. Also, Misty is quite popular. Her feisty personality and her love for water - type Pokemon make her a great character for fanfic writers to explore different storylines with, such as her own solo adventures or her relationships with other characters.
Definitely Pikachu. It's so iconic in the Pokemon world, and in fanfics, it often plays a central role, like being the Pokemon that saves the day in a tough situation.
Red and Blue themselves are often popular characters. Their rivalry and different approaches to Pokemon training can make for great stories. Also, Professor Oak is a well - liked character as he often plays an important role in the fanfic, like giving advice or providing new Pokemon to trainers.
One interesting storyline could be a trainer's journey in the Kanto region as depicted in the fanfic. They might encounter rare Pokemon that are not commonly seen in the original games, like a shiny Pikachu at the very start. This Pikachu could have unique abilities that help the trainer in unexpected ways during battles.
Charizard is a very popular Pokemon to feature in a 'pokemon red and blue fanfic'. It's powerful and has a cool design. Misty, the water - type gym leader, is also a great character to include. Her feisty personality can add a lot of drama to the story. Another popular character is Brock, with his love for rocks and Pokemon. He can be a source of knowledge for the main character in the fanfic. Plus, Team Rocket's Jessie and James are always fun to have in a fanfic. Their bumbling attempts at stealing Pokemon can create some humorous situations.
Brock is often a popular supporting character. In the original Pokemon Red and Yellow, he's part of the main group, and in fanfics, he can play various roles. He might be the one with all the knowledge about Pokemon types and training tips. Another popular one could be Pikachu. Even though it's the protagonist's main Pokemon, it can have interactions with Misty that are interesting to read. And sometimes, the other Gym Leaders from the games make appearances as supporting characters, like Lt. Surge or Erika.
There could be a Pokemon that has a really cute appearance but also has extremely powerful abilities. It becomes a fan favorite because it's both adorable and a force to be reckoned with in the story. In the pokemon red sun and blue moon fanfic, this kind of character can attract a lot of attention. It might have some special relationship with the main character, like being their first Pokemon or a Pokemon that saved their life once. This connection makes it even more appealing to the readers.
Mewtwo could be an interesting addition. Given its origin as a genetically - engineered Pokemon, it can bring a whole new level of complexity to the fanfic. It's extremely powerful and its internal struggle between its power and its sense of self can be explored in the context of the rescue team's adventures.
Some fanfics in the Pokemon Red, Blue, Green and Yellow universe might center around a time - travel concept. A trainer could accidentally travel back in time to the early days of Pokemon discovery in the Kanto region. There, they meet the very first Pokemon trainers and learn about the primitive ways of training and capturing Pokemon. This could involve trying to adapt their modern - day training knowledge to the more basic techniques of the past, while also dealing with the potential changes they might accidentally make to the timeline.
Pikachu itself is extremely popular. It's the iconic Pokemon of the franchise. In fanfiction, Pikachu can be given all sorts of personalities and abilities beyond what we see in the official games. For example, a fanfic could show Pikachu as a super - intelligent Pokemon that secretly guides Ash through tough situations.