One possible storyline could be Stiles finally finding the courage to stand up to his dad and seek help from his friends. His friends could then support him through the process of getting away from the abuse and starting to heal.
A storyline could also focus on how Stiles' experiences of being abused by his dad shape his relationships with others. He might be more hesitant to trust people, especially authority figures. But through the course of the story, he meets someone who helps him break down those walls and learn to trust again.
Maybe it involves Stiles' dad having some sort of mental breakdown that leads to the abuse. And in the fanfiction, Stiles discovers the root cause of his dad's behavior while also dealing with the emotional and physical pain. For example, perhaps his dad has unresolved trauma from his own past that he's projecting onto Stiles.
Stiles might develop trust issues. Since his own father has been abusive, he may find it difficult to trust other people, especially authority figures. This could impact his relationships in the long run.
He could overcome it through the support of his friends. If his friends are there for him, they can offer a safe space and positive reinforcement. For instance, they can remind him that he is not to blame for the abuse.
One way could be that Stiles finds a support system among his friends. For example, Scott could notice the signs of abuse and encourage Stiles to talk about it. They could then work together to find a solution, like seeking help from an adult they trust, such as a teacher or a local community leader.
Some writers might be exploring dark themes for the sake of drama. They think it can create intense emotions and complex character arcs.
One possible storyline could be Loki's struggle to break free from Odin's abuse and find his true self. He might start to gather allies secretly, like some of the more sympathetic Asgardians. Another could be Loki's internal journey of dealing with the emotional trauma, perhaps having flashbacks of the abuse while trying to perform his duties in Asgard.
Perhaps in the fanfiction, Bella could be in a situation where she tries to expose Edward's abusive behavior to the vampire community. This could lead to a complex web of relationships being affected as the vampires have their own set of rules and ethics regarding such behavior. And she may find some unexpected allies within the vampire world who help her get away from Edward.
Perhaps Percy is a single dad because his partner was lost in a battle against the Titans or some other great evil. In the fanfiction, he could be dealing with the grief of that loss while still being a great father. He might take his child on adventures around the places he used to go as a teen demigod, like the Labyrinth, but this time it's to teach his child about their heritage and how to survive in a world full of mythological threats.
One possible storyline could be exploring the emotional turmoil Peter goes through due to the abuse. He might struggle with his sense of self - worth and his relationship with other superheroes. Another could be his journey to overcome the trauma and find a way to heal, perhaps with the help of his friends like Ned or MJ.
One possible storyline could be Naruto gradually finding a small group of friends within the village who see his true self and help him stand up against the abusers. Another could be Naruto leaving the village for a time to train and gain power, then coming back to face the villagers and change their perception of him.
One possible storyline could be Peter trying to hide the abuse from May because he doesn't want to break her heart. He endures it in silence while still trying to be a hero as Spider - Man. Another could be that the abuse gets so bad that Peter's performance in school and as Spider - Man starts to decline, and his friends start to notice and try to figure out what's wrong. Or perhaps May finally discovers the abuse and has to make a tough decision about her relationship and protecting Peter.