One way is to develop complex characters. Give the abuser a backstory that makes their actions somewhat understandable, not justifying but adding depth. For Ichigo, show his internal struggle in detail. Another way is to add a lot of action. Maybe Ichigo tries to fight back in creative ways. Also, use vivid descriptions of the settings where the abuse takes place to create an atmosphere.
By developing strong characters. Make Gamzee's character multi - dimensional, with his own hopes, fears and quirks. Also, create interesting antagonists if there are any involved in the abuse situation.
To make it more positive, the fanfiction could introduce a mentor figure for Kuroko. This person could help him heal from the abuse and teach him how to be stronger both mentally and physically. Also, the story could end with Kuroko using his experiences to help others who are going through similar situations, turning a negative situation into a positive influence.
One way to make it more engaging is to create a build - up. Don't just jump straight to the spanking. Show the events that lead to it, like Lucy's repeated misbehavior and the warnings she received. Also, include some internal dialogue for Lucy. Let the readers know what she's thinking about the situation. And adding some humor or irony to the story can also draw readers in. For instance, if Lucy thought she could get away with something but then gets spanked in a really unexpected way.
By creating complex characters. Make the OC not just a victim but also have their own quirks, dreams, and flaws. Also, add more interactions with the main Naruto characters in unique situations.
To make it more impactful, you can use vivid descriptions. Describe the scenes of abuse and Ron's reactions very clearly. Also, tie the story into the larger Harry Potter universe. Maybe show how the abuse affects Ron's role in the fight against Voldemort or his standing in the wizarding community. And don't forget to give Ron a strong arc of growth and recovery, which will engage the readers more.
Involving other characters in an interesting way can make it more engaging. Maybe there's a character who is trying to understand what the baby is experiencing during hypnosis. They could be an older sibling or a parent. Their reactions and attempts to communicate with the baby can add depth to the story. Also, creating a sense of mystery around the hypnosis itself, like not revealing all at once why the baby was hypnotized or what the full extent of its effects are, can keep the readers hooked.
Adding a lot of vivid descriptions. For example, if the story is set in a forest, describe the lush greenery, the sounds of the animals, and the smell of the damp earth. This makes the setting more real for the readers.
Adding vivid descriptions of the emotions involved can make it more engaging. For example, describe the mother's fear, the father's anxiety.
To make a 'Naruto is heartbroken' fanfiction more engaging, focus on his emotions deeply. Describe how his heartbreak affects his daily life, like he might stop eating or training. Also, add some flashbacks to happier times to contrast with his current state.
Well, a theme might be the exploration of trauma. Ichigo's experience of being abused would surely cause him a great deal of trauma, and the fanfiction could delve into how he copes with it. It could also be about the discovery of inner strength. Despite the abuse, Ichigo could find strength within himself that he didn't know he had. And perhaps a theme of isolation, as he may be pushed away from others due to the abuse.