Often, there's the theme of friendship development. They start from being strangers or having a bit of a rough start, and then gradually become closer friends or even more. Also, the theme of cultural exchange can be seen as Capper has his own background different from Rarity's in Equestria.
Yes, there are some. You can try searching on fanfiction websites like Fimfiction. Some writers create interesting stories about their relationship, often exploring different scenarios and character developments.
Friendship is also a big theme. They come from different backgrounds but find common ground. Their journey of getting to know each other better and supporting one another is often depicted. For example, in some fanfics, Capper helps Rarity out of a tricky situation in his world, and in return, Rarity shares her knowledge of fashion with him.
One common theme is adventure. Capper, being a rather roguish character, and Twilight, with her magic and knowledge, often embark on exciting adventures together in fanfictions. They might be exploring new lands in Equestria or facing some sort of threat that requires both of their skills to overcome.
Another theme is her relationships. Fanfics often explore her friendships with the other ponies in Ponyville, like how she interacts with Twilight Sparkle or Fluttershy. For example, there are stories where she helps Fluttershy gain more confidence through fashion. Also, her rivalry with other fashion - minded ponies can be a theme, showing her competitive side in the fashion world.
One common theme is the struggle between good and evil. Since Nightmare Rarity is a darker version, there's often a battle within her or against other characters. Another theme is the power of friendship. Even in a fanfic about a villain - like character, friendship can play a role in her development. Also, the theme of transformation is common, whether it's her changing from Nightmare Rarity back to normal Rarity or evolving into something new.
One common theme is friendship. Their relationship is often explored in terms of how they support and care for each other. For example, Spike might help Rarity with her work, and Rarity might give Spike advice on his personal growth. Another theme is loyalty. Spike is very loyal to Rarity, and this loyalty is often a central part of the stories. Also, the theme of growth, both personal and in their relationship, is common. They might face challenges that force them to become better versions of themselves.
Another theme is self - discovery. Rarity is known for her love of fashion and Fluttershy for her kindness towards animals. In some fanfics, they encourage each other to explore new aspects of themselves. For instance, Fluttershy might become more assertive with Rarity's support, and Rarity might learn to be more in tune with nature like Fluttershy. This theme often ties in with their friendship as they grow together.
Often, there's the theme of self - discovery through love. Rarity might learn more about herself and her own desires while falling in love. And sometimes, there are adventure - related themes. Maybe Rarity and her love interest go on a quest together, and during that journey, their relationship develops. There can also be the theme of sacrifice, where one character has to give up something for the other in the name of love.
Friendship is also a big theme. Since My Little Pony is all about friendship, Capper's relationships with the ponies are often explored. He might learn valuable lessons about friendship, or help the ponies in their own friendship - related challenges.
One common theme is friendship. Given that they are from the My Little Pony universe where friendship is a central concept, many fanfictions explore how Twilight and Rarity's friendship grows and evolves.