Overcoming differences is also a frequent theme. Mal and Jane have distinct personalities. Fanfictions often show how they deal with their differences, like Mal's boldness vs Jane's shyness. They learn to accept and even use these differences to their advantage in various situations, which makes for an interesting read.
One common theme could be friendship. The hug might represent a moment of deepening friendship between Mal and Jane. It could be a sign of them coming to understand each other better.
You could also try reaching out to fanfiction communities or forums dedicated to the fandom that Mal and Jane are from. The members there might be able to point you in the right direction. They may have even written their own 'Mal Jane Hug' fanfictions and would be happy to share them with you.
I really like the fanfiction 'When Mal Met Jane'. It begins with their chance encounter and then delves into how they become friends. It shows how Mal's rebellious nature and Jane's kind-heartedness complement each other. There are a lot of sweet and funny moments in this fanfiction that make it a great read.
Mal might meet a group of outcasts like herself. They are all running from different problems but have formed a kind of family. Together, they teach Mal the importance of community and support, and they all help each other face the challenges that come their way.
A fanfiction might explore how Harry and Mal's relationship evolves after the events of Descendants 2. For example, Mal, now more in touch with her good side, tries to convince Harry to also look for a better way of life. Harry, initially resistant, slowly starts to see the value in what Mal is saying. Their interactions could be filled with tension, humor, and moments of real connection as they navigate their changing identities.
Perhaps Mal would make friends with a Hufflepuff. This Hufflepuff could be really kind and inclusive, and they would accept Mal for who he is right from the start. They could introduce Mal to the Hufflepuff common room and all the cozy traditions there. Another possible friend could be a Slytherin who has a similar background to Mal and they understand each other's motives and ambitions in the magical world.
Evie could be one of her allies. They are friends, and Evie is smart and can offer good advice on how to rule. Also, Jay might be on her side. He's strong and brave, which would be useful for protecting Mal as she tries to become queen.
For Mal, an actor like Tom Holland could be a great choice. He has that youthful charm and the ability to play a character who is in a strange situation. For Zeus, someone like Liam Neeson would be perfect. His deep voice and powerful presence would really bring the character of Zeus to life.
Jane is likely a fan - created character. She could be an ordinary girl who somehow gets transported into the Naruto universe and starts writing a diary about her new life there.