Perhaps Fairy Godmother. Since she has a lot of magic and knowledge, she could be a great help. She might be able to find a way to send the daughter back to her own time or at least give her some advice on how to survive in the past.
A common theme is the struggle with identity. Since she is the product of two very different backgrounds, she often has to figure out who she is. For example, she might question if she should be more like her mother, the former villain, or her father, the king of Auradon.
One interesting fanfiction could be about their daughter inheriting Mal's magic and having to learn how to control it in a world that is more accepting of magic than when Mal first arrived. She might struggle with the pressure of being the princess and having such powerful abilities.
Evie is a great character to include. She's Mal's best friend and has her own unique style and skills. Her knowledge of fashion could be used in a story, like if they need to create disguises or outfits for a special event in the fanfiction. Also, Jay could be included. His athleticism and thieving skills can add an element of action and adventure. He could be the one who steals a crucial item or gets them out of a tight spot.
One possible plot could be that Mal and Ben face challenges in raising their baby in a world where their kingdoms have different traditions. For example, Auradon might have very formal education and upbringing methods, while the Isle of the Lost has a more rough - and - tumble way. They have to find a middle ground to ensure their baby grows up well - adjusted.
One great Mal and Ben fanfiction could be about their adventures after the events of Descendants 2. Maybe they go on a secret mission to another isle to help some lost souls. It could be filled with magic and their growing relationship.
There might be a 'ben cheats on mal fanfiction' in the vast world of fan - created works. Fanfiction writers like to play with different plot ideas, and relationship betrayals are not uncommon. But it's also likely that it's a very niche or not - yet - written concept. If you're interested in this kind of story, you could also check out related fan communities where people might discuss or recommend such works.
Mercy's character development could start with her being a bit naive about the world outside of her family's influence. As the story progresses, she might experience betrayal from someone she thought was a friend. This would make her more cautious and less trusting. Then, she could have a mentor, perhaps an old wizard, who teaches her about the deeper aspects of magic. Through this, she grows in wisdom and power, and also becomes more empathetic towards others who are going through tough times. She would gradually transform from a sheltered girl to a strong - willed young woman.
One possible plot idea could be Mercy's struggle to find her own identity in the shadow of her famous parents. She might feel pressured to live up to their legacy. Another idea could be Mercy getting involved in a magical mystery that only she can solve, perhaps something that endangers the magical world her parents helped create. Or it could be a story about Mercy's first love and how she navigates the complex emotions while also dealing with the expectations of being the daughter of Ben and Mal.