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.
There's 'Soulmate's Journey' which is a really popular one. It delves into the idea that they are soulmates in a more spiritual and emotional sense. It has some really touching moments that show their love and loyalty to each other. It also includes some great action scenes that are true to the Bleach universe.
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.
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.
The potential for different storylines is a big factor. In the anime/manga, their relationship was left with some room for interpretation. Fanfiction writers can take this and create all kinds of scenarios, like alternate universes where they are from different social classes or have different powers. This allows for a lot of creativity and exploration of their characters.
One possibility could be that Ichigo is under some sort of mind - control. Maybe an enemy has found a way to manipulate his actions and he ends up hurting Rukia without meaning to. This could lead to a lot of internal conflict for Ichigo once he realizes what he has done.
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.
If it was a serious enough injury, Rukia might even start to resent Ichigo. Their relationship could change from a close friendship to one filled with animosity and mistrust. However, if Ichigo shows true remorse and tries to make amends, there could be a slow rebuilding of their relationship over time.
Lemon fanfictions usually involve adult - themed content which might not be suitable for all audiences. However, if you're specifically looking for Ichigo and Rukia - centered stories that are more on the romantic side without the 'lemon' aspect, there are many great ones out there. You could start by searching for stories with high ratings and positive reviews from other fans of the series.
There are quite a few out there. One that stands out is 'The Unspoken Promise'. In this fanfiction, Ichigo and Rukia have to face a new threat in Karakura Town. It's full of action and also shows their unwavering loyalty to each other. 'Soul Reaper Allies' is also good. It's about how they team up with other Soul Reapers and the interactions between Ichigo and Rukia during these missions are really well - written. 'Pathways of the Heart' is a more introspective fanfiction that explores their feelings for each other on a deeper level without any inappropriate content.