Well, a common theme is the discovery of unexpected feelings. Knuckles, who is usually so focused on his duties, suddenly realizes he has deep feelings for Rouge when they share a kiss. It can also be a theme of sacrifice. Maybe one of them has to sacrifice something important for the other, and the kiss is a bittersweet moment of connection before that sacrifice. And of course, there's the theme of mystery. The kiss could be part of a larger mystery that they are trying to solve together, like a secret about their pasts or some ancient prophecy.
One popular type is adventure - based fanfiction. For example, there could be a story where Knuckles and Rouge team up to find a lost ancient relic. They have to overcome various obstacles and enemies in their path.
In Knuckles and Rouge kiss fanfiction, a common plot is the discovery plot. They discover something about each other that makes them see each other in a new light, leading to a kiss. Another plot is the adventure - induced - love plot. They go on an adventure together, face many challenges, and their shared experiences bring them closer until they kiss. There is also the self - discovery plot. Through their relationship with each other, they learn more about themselves, and the kiss is a moment of realization and connection.
There could be a theme of sacrifice as well. They might have to sacrifice some of their previous ways of life, like their solo adventures or their more carefree attitudes. And also, how they come to terms with the fact that their lives are now centered around this new family they are creating.
Many of these fanfictions play with the idea of them being on opposite sides but finding common ground. They might start out as rivals or even enemies but gradually develop feelings for each other. The best ones also incorporate elements from the Sonic universe, like references to other characters or locations. For instance, they could meet in a hidden temple on Angel Island, which adds an extra layer of authenticity to the story. Another characteristic is the development of their relationship. It's not just about them falling in love immediately. It's a slow - burn process where they learn to trust and respect each other.
A sense of isolation is sometimes a theme. Rouge may feel isolated as a vampire, different from her previous self and those around her. And Knuckles may also feel a sense of isolation in trying to deal with Rouge's situation on his own, without fully understanding the vampire world. This creates a complex emotional landscape in the fanfictions.
A common theme is the clash of their personalities. Rouge is sly and often self - interested while Knuckles is noble and duty - bound. Their relationship development is also a big theme, whether it's friendship or something more romantic.
One common theme could be the adjustment to the new situation. Both Rouge and Knuckles would need to adapt to the idea of becoming parents. Another theme might be the protection of the unborn child. Since they are often in a world full of action and danger in their original stories, this would be an important aspect.
One common theme could be conflict. Given that Knuckles is hurting Rouge, there might be a story of betrayal or misunderstanding between them.
A common theme is the 'opposites attract' concept. Since Knuckles is a guardian and more straightforward, while Rouge is a jewel thief with a bit of mystery. Another theme is the idea of trust - building. They have to overcome their initial differences and learn to trust each other. For example, in some stories, Knuckles has to trust Rouge not to steal precious items he's guarding.
One common theme could be adventure. Given that Knuckles and Rouge are characters often involved in action - packed scenarios in the Sonic series, fanfictions might continue that trend. Another theme could be a sort of 'forbidden love' since they are from different 'groups' in the Sonic world.