There are several common themes in such fanfiction. One is the theme of self - discovery. Ichigo might be on a journey of self - discovery and in the process, his actions or words might hurt Rukia. For example, he could realize something about himself that makes him distance himself from her, which causes her pain. Another theme is the idea of fate. If the story is set in a world where fate has a strong influence, Ichigo might be fated to do something that hurts Rukia, like being part of a prophecy that requires him to sacrifice her in some way. Additionally, the theme of jealousy can also be present. If Ichigo shows jealousy in an inappropriate way or towards the wrong person, it can lead to him hurting Rukia.
It could be a way to test the strength of their bond. By putting Ichigo through pain caused by Rukia, the fanfiction can show how deep their connection really is, whether it can withstand such hardships. Also, it might be a different take on the characters. Maybe the writer wants to show a more complex side of Rukia or Ichigo, and this type of plot allows for that exploration.
One possible fanfiction could be where Rukia's actions during a battle put Ichigo in a difficult situation that physically hurts him, like accidentally leading enemies to his location. Another might involve Rukia making a decision that emotionally hurts Ichigo, such as choosing her duties over their friendship at a crucial moment.
One common theme is the adjustment to married life. They come from different backgrounds, so seeing how they adapt to living together is popular. Another is the support they give each other in battles and in dealing with the various hierarchies in the Soul Society.
One common theme is sacrifice. In many fanfics, either Ichigo or Rukia is willing to sacrifice themselves for the other. Growth is also a theme. They both grow as characters, learning from each other and becoming stronger together. For example, in some fanfics, Rukia helps Ichigo better understand his Soul Reaper powers, and Ichigo helps Rukia open up more emotionally. This mutual growth is often a central part of the story.
A prevalent theme in such fanfiction is the power of love to overcome differences. Ichigo is human (sort of), and Rukia is a Soul Reaper. Their love defies these boundaries. Also, the theme of loyalty often shows up, as they are loyal to each other through thick and thin.
In fanfictions about their love, a frequent theme is the struggle against the odds. Given their different natures and the rules of the Soul Reaper world, being together is not easy. There are also themes of loyalty and trust. They trust each other completely in battle, and this trust extends into their romantic relationship. Additionally, the theme of forbidden love can be present. Since there are likely rules against a human and a Soul Reaper being together, their love is a defiance of those norms, which makes it all the more exciting and passionate.
Another theme could be power - up or training arcs. Since both Ichigo and Rukia are involved in battles and have powers, fanfictions sometimes focus on them training together or unlocking new powers while being in a relationship. This not only shows their growth as individuals but also how they support each other in their journey to become stronger.
One popular theme is adventure. Writers often create new adventures for Rukia and Ichigo, where they face powerful enemies together and their relationship deepens through these challenges.
One common theme is power combination. Since Ichigo and Rukia have different powers, fics often explore how these powers can work together. For example, in many fics, they combine their spiritual energy to defeat a stronger foe.
I'm not sure of specific 'ichigo hurts rukia fanfiction' stories off the top of my head. You could try searching on fanfiction - specific websites like FanFiction.net or Archive of Our Own. They usually have a wide range of stories based on different themes and pairings, and you might be able to find some there.