The main character, Poppy, is often a popular choice. Her complex personality and her journey are full of potential for fanfiction writers to explore further.
I think the side characters with unique abilities are very interesting to write about. They often have untapped potential in the original story that can be fully explored in fanfiction. For instance, a character who has a minor role but a really cool power can be given a more prominent role in a fanfic. Also, characters who are in a love triangle or have complex relationships with other characters can be great to write about as it allows for a lot of emotional exploration.
Well, adventure is a big theme. Writers like to take the characters on new quests or challenges that weren't in the original story. It could be something like a hidden treasure hunt or a dangerous mission in a new, uncharted territory. Then there's the theme of power. How characters gain, lose, or struggle with their powers can be really interesting. And of course, friendship. Some fanfictions show how the characters form deeper friendships or how their existing friendships are tested in different situations.
However, the beauty of fanfiction is that the author might introduce their own original characters as well. These new characters could be friends, foes, or love interests for the existing characters. They might even play a crucial role in changing the direction of the story.
Obviously, Ash is one of the most popular characters. Since it's Smart Ash Fanfiction, his new intelligent side makes him a central focus. Pikachu is also very popular as his ever - faithful partner. And Misty often appears too, with her feisty personality adding to the story dynamics.
The OC themselves are often popular characters. Since they are original creations, they can have all sorts of unique personalities, abilities, and backstories. For example, an OC could be a shy but brilliant Pokemon trainer who gradually overcomes their insecurities with Ash's help.
One popular character is Misty. She often appears in fanfiction and can have different roles. Sometimes she's a strong supporter of Ash in his Dex Holder adventures, and other times she might be on her own journey but still cross paths with Ash. Her feisty personality and love for water - type Pokemon make her an interesting addition to the stories.
Obviously Ash is one of the most popular characters. And then there are the gym leaders like Brock, Misty (who also has gym - related aspects in some versions), and other gym leaders from different regions.
Obviously, Ash is one of the most popular characters as the story often revolves around him. His Pikachu is also a very prominent character. Other popular characters can include Gary Oak, who is often portrayed as Ash's rival in these fanfictions. Then there are the various Pokémon Ash catches or befriends along his journey, like Charizard or Bulbasaur.
Obviously, Ash himself is the central character. His Pikachu is also often prominently featured, as it's his most iconic Pokemon. Sometimes, his other Pokemon like Charizard or Greninja might also play important roles in his self - training journey, either as partners in training or as sources of inspiration for him.
Often, the main protagonist from the original Shadow and Ash is very popular. Their adventures and growth are a central focus in many fanfictions. Also, the antagonist with a complex personality can draw a lot of attention. People like to explore their motives and possible redemption arcs.