Yes, there are quite a few. You can find them on fanfiction platforms like Archive of Our Own. Some might focus on their adventures together in the Descendants universe, exploring their relationship in different scenarios, like teaming up against a new threat or just getting to know each other better on a personal level.
A fanfic could focus on their relationships in a more slice - of - life setting. Maybe they decide to have a weekend getaway and all the little things that happen during that time. There could be some cute moments like Jay teaching Carlos some new parkour moves, Mal and Evie having a girl - talk about their future dreams, and then at night they all gather around a campfire sharing stories.
One great fanfic could be about Mal, Evie and Lemon going on a magical adventure together in the Isle of the Lost. They might face challenges like a new villain emerging and they have to use their combined skills to defeat it.
One reason could be that Harry is more exciting. Ben is a bit too proper and goody - two - shoes for Mal sometimes. Harry has that edge of danger that Mal might find more appealing.
The 'forbidden love' trope is quite common. Since they come from different worlds in the Descendants universe, their relationship might be seen as unacceptable by some. Also, the 'character growth' trope. Through their interactions, both Harry and Mal grow as characters. For example, Mal might learn to be more spontaneous from Harry, and Harry could learn more about loyalty and friendship from Mal. There are also fanfics that use the 'fish out of water' trope when they visit each other's worlds.
Friendship is a very common theme. Mal and Evie are often depicted as having a strong, unbreakable bond. Their friendship is shown as something that can withstand any challenges thrown at them.
Well, a 'Total Drama All Stars Mal Fanfic' could explore the character of Mal in more depth. Maybe it shows her backstory, her motives that weren't fully explored in the original show. It could also put her in different scenarios and relationships with other characters from the series.
One common theme is the exploration of their friendship. Since they come from different backgrounds, it's interesting to see how they bridge those gaps. For example, Mal being from one group and Harry from another.
One popular Mal and Harry fanfic might be 'Mal's New Adventure with Harry'. It could explore their relationship in new and exciting ways, like them going on a magical quest together. Another could be 'Mal and Harry: A Different Bond' which might focus on how their different personalities complement each other in the story. There are also fanfics that might be set in alternate universes, such as 'Mal and Harry in a Modern World' where they have to deal with modern - day problems while still having their magical connection.
One common theme is the clash of different worlds. Harry comes from the wizarding world and Mal from the Descendants world, so there's often exploration of how their different cultures and powers interact.