One common theme is the struggle with cultural differences. Since Starfire is from Tamaran and Robin is from Earth, they often face misunderstandings because of their different upbringings. Another theme is the idea of forbidden love, as they are teammates and sometimes there are rules against romantic relationships within the team.
A common theme is the exploration of their cultural differences. Starfire is an alien and Robin is from Earth, so many fictions play with how they bridge that gap in their relationship. For example, how they communicate their feelings when their cultures have different norms regarding love and courtship.
Love is a very common theme. Since they have a strong connection in the original series, fanfictions often explore their romantic relationship in more depth, like how they first fell in love or how they overcome relationship problems.
One common theme is the exploration of their different cultural backgrounds. Since Starfire is from another planet, her and Robin's relationship can be used to show how they bridge the gap between their cultures, especially when it comes to expressions of love like kissing.
The theme of self - discovery is also prevalent. As they fall in love, both Starfire and Robin learn more about themselves. They grow as individuals while also growing closer as a couple, which is a really engaging aspect in a lot of Starfire x Robin fanfiction.
Another theme is redemption. Red X is often a character who has room for growth and change. So, many fanfictions involve him trying to make up for his past wrongs and earn the respect of Starfire and Robin.
The theme of 'protection' is also quite common. Robin often feels the need to protect Starfire, whether it's from villains or from the difficulties of living on Earth. And Starfire also tries to protect Robin in her own way. Additionally, the theme of 'discovery of love' is prevalent. They start as friends or comrades and gradually discover their romantic feelings for each other over time.
One common theme is the exploration of their relationship in a more adult or romantic context. Since they have a complex relationship in the original source, fanfics might delve deeper into their feelings for each other.
Love and friendship are very common themes. Their relationship is often shown as evolving from friendship to a deeper romantic love. For instance, in many fanfics, they start as teammates in the Teen Titans and gradually realize their feelings for each other.
Love is a very common theme. It could be about the choice between Robin and Starfire's love for each other and their loyalty to the Teen Titans. For example, they might have to choose between a romantic moment and answering a call for help.
There could also be themes of sacrifice. For example, Blackfire might have to sacrifice her own goals or allegiances in order to be with Robin. Or Robin might have to make difficult choices regarding his relationship with Blackfire and his duties as a hero.