Yes, there are many non - adult fanfics related to Myrcella. Some might focus on her character development, her relationships with other characters like her family members or potential friends in a more platonic way. For example, a fanfic could explore how she might have influenced the political situation in Dorne had she lived longer through diplomatic means rather than any inappropriate scenarios.
A fanfiction could revolve around Myrcella being a key figure in helping Jon Snow claim his rightful place in the Seven Kingdoms. Since she has been exposed to the politics of King's Landing, she could use her knowledge and influence to support Jon, who has his own claim through his Targaryen heritage. Their story could be about uniting different factions and bringing a new era of peace to Westeros.
Perhaps Myrcella is sent to the Wall as part of a political maneuver. There she meets Jon Snow. At first, they are at odds, but as they get to know each other, they find common ground. They learn of a conspiracy that threatens both the North and the South of Westeros. Together, they embark on a journey to expose the conspiracy and save the kingdoms. This would involve them facing many obstacles, including distrust from their own people and powerful enemies who want to keep the conspiracy hidden.
Love and loyalty also feature prominently. An OC Baratheon might be torn between loyalty to their family and their love for someone from another house. This creates a lot of internal conflict and interesting plotlines. In some stories, an OC Baratheon's loyalty to a friend or a romantic partner can change the course of events in the political landscape of Westeros.
Some fanfictions might focus on an alternate universe where Joffrey is not a king. He could be a simple knight, and the story could explore how his personality would develop without the power and privilege of the throne. He might learn humility and honor in a different way.
Her kindness. In the show, she showed a certain level of kindness that could be further explored in fanfics. For instance, how her kindness might have affected those around her in Dorne, like the servants or the common people she interacted with.
One great 'Game of Thrones OC Baratheon fanfiction' is 'The Baratheon Heir'. It has an interesting plot where the OC Baratheon character tries to reclaim the family's lost glory in a really engaging way.
In some fanfictions, Joffrey is re - imagined as a more sympathetic character. His cruel actions are often explained as a result of his upbringing and the political pressures around him.
She could also be shown as a great warrior in certain fanfictions. Despite the norms of the society in Game of Thrones that often restrict women's roles in combat, she breaks free from those constraints. She trains in secret and then emerges as a surprise defender of her family when they are under attack.
Another aspect that fanfictions often explore is her relationship with other members of the Baratheon family. In some stories, she could be at odds with Cersei, seeing through her false charm and manipulative ways. This creates a power struggle within the family, which is a common and engaging theme in Game of Thrones fanfiction.