Well, many fans like to write about Owen. He has a lot of potential for different storylines in fanfiction. His relationship with the other characters, especially his interactions with Keith and Bethany, can be developed in really interesting ways. Also, the villains in Story Thieves can be popular in fanfiction. Writers can explore their backstories and motives more deeply, like the character who tries to stop the story thieves at all costs.
Keith is often a popular choice. His unique ability and his role in the original story make him an interesting character to explore further in fanfiction. Another popular one is Bethany, with her connection to different worlds and her own set of skills.
The Black Mage is often a popular choice. His powerful and mysterious nature makes for great storytelling. Writers can explore his backstory, his motives, and his relationship with other characters in the Maple World.
Ash Ketchum is a very popular choice. His adventures in the Pokemon world are well - known, and fanfiction writers can continue his journey, give him new challenges, or even put him in alternate universes.
In Marauders story fanfiction, Sirius Black is often a central character. His good looks, charm, and his break from his pure - blood family traditions are all appealing aspects. James Potter is popular as well, especially when it comes to his growth from a bit of a bully to a more mature person. Remus Lupin is beloved for his quiet strength and the way he copes with his lycanthropy. Lily Evans also features prominently in many fanfictions as she is the love interest of James and has her own strong personality.
Jase Ballenger is often a popular choice. His complex character, being a thief leader, offers a lot of scope for fanfiction. Writers can explore his leadership decisions and his inner thoughts.
Joker is often very popular in fanfiction. As the leader of the Phantom Thieves, he has a lot of mystery and charisma. Writers like to explore his backstory further or put him in different, challenging situations where he has to use his wits and Persona powers in new ways.
Sakura is also quite popular. Fanfiction often focuses on her development as a kunoichi, her relationships with Naruto and Sasuke, and how she overcomes her insecurities. There are many stories that give her more agency and power than in the original series.
Dr. Colosso, the family's pet bunny who is actually a supervillain, is another popular character. Fanfiction might explore his backstory more deeply or have him team up with other villains in a plot to finally defeat the Thunderman family.
JD Fenix is also quite popular. As Marcus's son, he has his own story arc in Gears 5 that can be expanded upon in fanfiction. You can explore his relationships with other characters more deeply, like his friendship or rivalry with other soldiers. Del Walker is another character that fans like to feature. His unique personality and his role in the team can lead to some interesting fanfic stories.
Jareth is by far one of the most popular characters. His mysterious and powerful nature makes him a fascinating subject. Writers can explore his backstory, his relationship with the Labyrinth, and his complex emotions.
Neo is definitely one of the most popular. His journey as 'The One' offers a lot of scope for further exploration. Writers can continue his story after the events of the movies, or even rewrite parts of it. Trinity is also very popular as she is a strong female character. Fanfiction might explore her past more or create new adventures for her. Morpheus is another favorite, with his wisdom and leadership being great elements to build stories around.