The fanfiction 'Mewberty Jackie: A Different Perspective' is also worth checking out. It offers a unique view of Jackie during the Mewberty situation. It explores how her relationships with other characters change and evolve due to the Mewberty - related events, and it's written in a very engaging style.
Obviously, Jackie is one of the main characters. She is often at the center of the story, dealing with the Mewberty situation. Star is also likely to be a main character as the show is named after her and her world is the backdrop for these fanfictions. And there could be other characters like Marco who might play important roles in the fanfictions as well, since they are all part of the same universe.
One interesting aspect could be the exploration of Star's character during her Mewberty transformation. It might show her dealing with new powers and emotions in ways not fully explored in the original show.
Another plot might involve Star interacting with characters from different dimensions during her mewberty. For example, she could team up with a group of misfit magical beings to save a world that is being threatened by a common enemy. And her mewberty powers play a crucial role in the fight.
Well, there's a fanfic I heard about called 'Jackie's Perspective'. In this fanfic, it's told from Jackie's point of view. It delves into her feelings for Marco, how she first noticed him, and how their relationship developed over time. It might also include some of the insecurities she has, especially with all the magical elements that Star brings into Marco's life. There could also be a fanfic that focuses on their adventures together outside of the main plot of the show, like 'Marco and Jackie's Side Quests' where they go on their own little adventures and face unique challenges as a couple.
One popular 'Star vs the Forces of Evil' fanfiction is 'The Lost Princess'. It delves deeper into Star's backstory and her family's secrets. Another great one could be 'Marco's New Adventure' which focuses on Marco's character development in unique situations that the show didn't fully explore.
One good 'Star vs the Forces of Evil Janna' fanfiction could be 'Janna's Mysterious Adventures'. It might explore Janna's character more deeply, showing her getting involved in some magical quests in the world of the show. Another could be 'Janna and the Forbidden Spell', where she discovers an ancient spell and has to deal with the consequences.
Obviously, Star is a main character. She is at the center of the story, especially with her mewberty aspect.
One interesting fanfiction could be about an alternate universe where Star and Marco's roles are reversed. Another might focus on a backstory for one of the minor characters like Pony Head. And there could also be fanfictions that explore what would happen if the magic in the 'Star vs. the Forces of Evil' world suddenly disappeared.
There might be a fanfiction that focuses on the backstory of the villains in 'Star vs Forces of Evil'. It could explore their motives and how they became the forces of evil in the first place. For example, it could show how Toffee's past experiences shaped his hatred for the Butterfly family.
One interesting fanfiction could be about Star and Marco exploring a new dimension that was previously unknown in the show. In this dimension, they encounter strange creatures and have to use their combined skills to find a way back home.