The main character's rival is always a great addition. A cocky but talented trainer who constantly challenges the protagonist. Also, the professors in the Ruby world, like Professor Birch. He could be a source of knowledge and guidance for the main character. Then there are the Pokemon themselves. A Pikachu with a sassy attitude or a Mudkip that's really shy can be really fun characters. And don't forget about the shopkeepers and healers in the different towns. They can have their own little stories and quirks.
One interesting character to include could be an old - time Pokemon trainer who has a lot of wisdom and stories to tell. He could have been around during a significant event in the history of the Hoenn region. A wandering Pokemon breeder who has unique insights into Pokemon breeding and genetics could also be a great addition. And what about a mysterious girl who seems to have a special connection with Legendary Pokemon? She could be a key figure in the fanfic, leading the main character on a journey to discover the secrets of the Legendary Pokemon in the Ruby world.
You could include the Gym Leaders from Pokemon Ruby. They have distinct personalities and battle styles. For example, Wallace, the Sootopolis City Gym Leader. His elegance and powerful Water - type Pokemon make him a great character. Another interesting character could be Steven Stone. He's a strong trainer and a bit of a mystery. And of course, the Team Magma or Team Aqua grunts. They add an element of conflict to the story.
A great character to add could be a wandering trainer from another region who has come to Hoenn specifically because of the rumors about the Ruby and Sapphire. This character could have unique Pokemon and battle styles that the local trainers haven't seen before. Additionally, the Sootopolis City Gym Leader, Wallace, is a very elegant and powerful character. His presence can add a touch of grace and high - level Pokemon battles to the fanfic.
Sylveon is a very charming Pokemon. In a harem scenario, it could be the Pokemon that brings harmony to the group with its fairy - type nature. And then there's Lucario. It's strong, intelligent, and has a sense of honor. It could play the role of the protector in the harem, making sure all the other Pokemon are safe while also having a special bond with the trainer.
Well, you could include Hilda from Pokemon. She's a strong and adventurous character who would be really curious about the Yo - Kai. For Yo - Kai, you could have Komajiro. He could be the little troublemaker who gets into all kinds of scrapes with the Pokemon. And Professor Oak could also be in the fanfic. He could be fascinated by the Yo - Kai and try to study them, while also helping the trainers understand the new situation they're in.
Archie or Maxie would be great choices. These two characters have complex motives in the game. In a fanfic, you could develop their relationship further, perhaps showing how they came to their extreme views on the balance of nature in the Hoenn region.
Ash is always a popular choice. His experience and determination can add a lot to a fanfic. You can create new adventures for him, like facing a powerful, never - before - seen Legendary Pokemon.
Ash Ketchum is always a popular choice. His long - running journey through different Pokemon generations provides a lot of material for fanfic writers. You can write about his new adventures, or what if scenarios like what if he had chosen a different starter Pokemon in a certain generation.
The main character from Pokemon Sun, of course, is essential. You could also add in some original characters, like a mysterious trainer from another region who has come to Alola in search of a specific Pokemon. Professor Kukui can be a great supporting character, providing knowledge and guidance. And don't forget about the Ultra Beasts. You could create a character who has a special connection to an Ultra Beast, perhaps they can communicate with it in some way.
Ash Ketchum is a classic choice. His experiences and growth throughout his journey can serve as inspiration or even be part of a parallel story in the fanfic. You could also include his Pikachu, which is an iconic Pokemon.
Definitely Serena. She's a well - known character from the Kalos region. Her journey as a Pokemon trainer and her relationship with Ash can be explored further in a fanfic.
Seto Kaiba and Gary Oak would make for a fascinating pair in a crossover fanfic. Kaiba's arrogance and Gary's self - assuredness could lead to some intense rivalries. They might compete to see who can be the best in both the Yugioh and Pokemon worlds. Another interesting character would be Serena. Her kind - hearted nature could be a contrast to some of the more intense Yugioh characters. She could form bonds with the Duel Monsters in a different way than the other characters, perhaps using her compassion to calm down some of the more aggressive ones.