Not knowing precisely what 'x rub rose' represents, we can make some assumptions. If it's about a magical rose and 'rub' is an action related to it, themes of magic and transformation could be common. Also, if there are characters involved, relationships and their development would be a likely theme. Maybe the rose has some special power that gets activated by 'rub', which could lead to themes of power and responsibility.
Since the nature of 'x rub rose' is ambiguous, common fanfiction themes might still apply. For instance, if this is set in a fictional universe, exploration of that universe could be a theme. If 'rose' is a symbol, it could represent different things like hope or passion. And 'rub' might be the trigger for something in the story, so themes around cause and effect could also be present. It really depends on how the author interprets this rather mysterious 'x rub rose' concept.
I'm not sure specifically about 'x rub rose fanfiction'. But you can try searching on some popular fanfiction websites like Archive of Our Own. There might be various works related to roses or something named 'rub' in a fictional context that you could discover.
Conflict is also often seen. It could be external conflict, like they are against some common enemy, or internal conflict, such as one 'rose' having doubts about their relationship with the other. This conflict then drives the plot of the fanfiction forward and makes the story more interesting.
One common theme is adventure. Ruby Rose is often depicted going on exciting quests, exploring new places and facing dangerous challenges. Another theme is friendship. Her relationships with her friends are explored deeply, showing how they support and rely on each other.
One common theme is loyalty. Pearl's unwavering loyalty to Rose is often explored in great detail. Another theme is sacrifice, as Pearl has sacrificed a lot for Rose in the original story and this is further developed in fanfiction.
One common theme is the exploration of their contrasting personalities. Kanaya's calm and composed nature against Rose's more complex and sometimes impulsive self. For example, in many fanfictions, they help each other grow by learning from these differences.
One common theme could be the exploration of their relationship in a more romantic and intense way. Since it's a fan - created concept, it might focus on the emotional connection between Steven and Rose.
One common theme is adventure. The OC and Amy Rose often go on quests together in the Sonic universe, facing various villains and challenges. Another theme is friendship that gradually turns into love. At first, they might be just friends or allies, but as the story progresses, they develop deeper feelings for each other.
The theme of 'forbidden love' might also be present. Depending on the fictional universe they are in, there could be reasons why their relationship is not initially accepted or is difficult to pursue. This adds a layer of drama and tension to the fanfiction, making the story more engaging as the characters try to overcome these obstacles to be together.
Love and friendship are common themes. Often, the human and Amy Rose start as friends and then develop deeper feelings. Another theme is adventure, as they might go on quests together in the Sonic - inspired world.
Love and romance are really common themes. Writers often explore how the reader and Ruby could fall in love. There's also the theme of self - discovery. The reader might discover new things about themselves while interacting with Ruby. For example, they could find out they're braver than they thought. This can be really interesting as it shows the growth of the reader character in the story.