Friendship is a very common theme. They are often depicted as becoming good friends and helping each other out. For example, in many stories, they support each other during difficult times like when Scootaloo is having trouble with her flying lessons or when Rumble is feeling left out among his Pegasus peers.
Perhaps a fanfiction where Rumble gets injured while flying and Scootaloo helps him recover. During this time, they learn more about each other's dreams and fears. Scootaloo could share her insecurities about not being able to fly as well as other Pegasi, and Rumble could comfort her and tell her about his own struggles in flying competitions.
One potential theme could be growth. Both characters could grow as individuals through their interactions. For instance, Scootaloo might become more confident and Rumble could become more empathetic.
Well, it could be about their adventures together. Maybe they team up to solve a mystery in Ponyville. They could be exploring an old, spooky place looking for a lost artifact or something.
One interesting aspect could be the friendship development between Rumble and Scootaloo. In many fanfics, they might go on adventures together, which showcases their unique bond. For example, they could explore new parts of Equestria that are not often shown in the original series.
Definitely Rainbow Dash. Since Scootaloo looks up to her, Rainbow Dash could offer some flying tips or be a mentor figure. Fluttershy would also be great. Her gentle nature could contrast with the more energetic Scootaloo and Rumble, and she could help them when they encounter some scared animals during their adventures.
Perhaps a story where Scootaloo and Rumble get into an argument over which pony tribe is better, the pegasi or the earth ponies. But then they are forced to work together when a strange magic starts affecting the ponies of their respective tribes. As they work together, they realize that each tribe has its own strengths and that they were wrong to argue in the first place.
You can start by looking on popular fanfic websites such as Fimfiction. There, you can simply search for 'Rumble and Scootaloo' in the search bar, and a list of relevant fanfics will come up. Sort them by popularity or rating to find the ones that are well - liked.
One great Spike x Scootaloo fanfiction is 'The Unlikely Bond'. It shows their friendship evolving in a very heartwarming way. Another could be 'Adventures Together' which takes them on an exciting journey across magical lands. There are also many on fanfiction platforms like Fimfiction where you can explore different takes on their relationship.
You can find Spike x Scootaloo fanfiction on Fimfiction.net. It's a popular website for My Little Pony fanfictions. Just type 'Spike x Scootaloo' in the search bar and a whole list of relevant stories will pop up.