The main trainer is a common character, of course. Also, popular Pokemon like Pikachu, Rowlet, and Litten often appear. They might be part of the 'harem' around the trainer. And sometimes, the Alolan regional forms of Pokemon, such as Alolan Vulpix, could also be included.
Lillie is also a main character. She has her own story arc, especially regarding her relationship with Pokemon and her growth from being initially afraid of them to becoming more confident. And her family's secrets might also play a role in the fanfic.
Gladion is also quite popular. His cool and mysterious demeanor, along with his strong Pokemon battling skills, draw a lot of attention. Fanfic writers might write about his past, his relationship with his sister Lillie, or his battles against powerful opponents.
The trial captains are quite popular in Pokemon Sun and Moon slash fanfiction. For example, Kiawe might be depicted in various new situations. Writers could show him having to deal with a new type of Pokemon problem or having an unexpected friendship with another character. Gladion is also popular as he has a mysterious aura, and fanfictions often delve into his past and his true motives.
Lillie is often a popular character. She has an interesting backstory and her relationship with the Pokemon is quite endearing. Another popular one is Ash. He is a well - known character from the Pokemon series and his adventures in the Alola region in Pokemon Sun and Moon are always exciting to read about in fanfiction. And of course, Team Skull members can be popular too, as they add a bit of a 'bad boy' element to the stories.
One possible fanfiction could be about Mallow's journey to discover new and rare ingredients for her cooking. Maybe she ventures into a mysterious forest in Alola and meets a Pokemon that has the ability to guide her to a hidden grove filled with unique berries and herbs that she can use to create a special dish for a big island festival.
One possible fanfiction could be about Wicke's backstory. Maybe she has a hidden past as a trainer herself before devoting her life to research in Alola. In the fanfiction, she could discover an ancient Pokemon that has a connection to the history of the Alola region and she has to protect it from Team Skull.
Gladion's role in Pokemon Sun and Moon fanfiction can be multi - faceted. He can be a rival to the protagonist, pushing them to become better trainers. His connection to Team Skull also adds an interesting layer to the story. Moreover, his relationship with other characters like the Kahunas can be explored in fanfiction, creating more complex storylines.
In Pokemon Sun and Moon fanfiction, Gladion is a character that can bring a lot of depth to a story. His internal struggles, such as his conflict between his own goals and the expectations of those around him, are often explored. His growth as a character is also a popular aspect. Writers might show how he overcomes his insecurities and becomes a stronger trainer and person. His Pokemon battles in fanfictions are usually intense, as his Pokemon are not only strong but also have a special bond with him.