One common theme is friendship development. Since they have different personalities, seeing how they become closer is often explored. Another theme is mutual support. For example, Rainbow Dash might encourage Fluttershy to be more brave, and Fluttershy could help Rainbow Dash be more patient.
A recurring theme is the power of their bond. In many fanfics, their relationship is shown as something that can overcome difficulties. Whether it's dealing with a villain in Ponyville or just getting through a tough season, their connection is what helps them. Another common aspect is the exploration of their different elements of harmony and how they work together because of their relationship.
Often, the theme of acceptance is present. They accept each other's quirks. Rainbow Dash accepts Fluttershy's shyness, and Fluttershy accepts Rainbow Dash's brashness. Also, adventure can be a theme. They might go on an adventure together, like exploring a new part of Equestria, which tests and strengthens their relationship.
Another theme is the idea of friendship turning into love. They start as friends, and through shared experiences and understanding, their relationship deepens romantically. For example, in many fanfics, a joint adventure or a difficult situation they face together sparks new feelings.
Another common theme is adventure. Fanfics often send them on exciting adventures, whether it's exploring a new part of Equestria or going on a quest to find a magical item. Their different skills and personalities, like Rainbow Dash's speed and Fluttershy's ability with animals, play important roles in these adventures. They might also learn something new about each other during the adventure, strengthening their bond.
Another theme is adventure. They could go on quests together, like finding a lost magical item in the Everfree Forest. This allows for exciting storylines and shows how they rely on each other's strengths, with Rainbow Dash's courage and Fluttershy's knowledge of nature.
One common theme is friendship. Given that they are both characters from the MLP universe which highly values friendship, many fanfics explore how their friendship develops. Another theme is competition, as both are pegasi and might compete in flying races or other aerial challenges in the fanfics.
A sense of discovery is also prevalent. The reader discovers new aspects of Equestria, new magical elements, and also discovers more about themselves and their relationship with Rainbow Dash. This can include learning about new flying techniques if the reader is also a pegasus in the story, or just exploring new parts of the land together.
Overcoming differences is also a theme. Fluttershy is shy and gentle while Rainbow Dash is bold and energetic. Fanfics often show how they deal with these differences in a relationship, like Rainbow Dash helping Fluttershy be more confident and Fluttershy teaching Rainbow Dash to be more sensitive.
Another theme is competition. Given their speed - based abilities, it's not uncommon for fanfics to pit Rainbow Dash and Sonic against each other in races or challenges. However, these competitions usually end up with them learning from each other and becoming better friends in the process. It's a way to explore their personalities and how they deal with winning and losing.
Friendship is also a major theme. Their relationship is explored in different ways. Sometimes it's about how they support each other during tough times. Like in some fanfics where Scootaloo gets bullied for her lack of flying ability, Rainbow Dash is there to cheer her up and encourage her.
One common theme is failure. For example, Rainbow Dash might fail at a big race or competition, leading to her feeling sad and disappointed in herself.
One common theme is competition. Since both are excellent fliers, many fanfics revolve around their rivalry in flying competitions. For example, they might compete for the title of the fastest flyer in Equestria. Another theme is friendship. As they interact more, they often learn to respect and become friends with each other.