Growth and self - discovery are also common. For example, there are stories where Spike discovers his hidden talent for art with Sweetie Belle's encouragement, and Sweetie Belle learns to be more patient through her experiences with Spike.
Adventure is also quite common. Since the My Little Pony world is full of magic and different lands, fanfics could have Sweetie Belle and Spike going on all sorts of adventures. Maybe they are searching for a lost magical artifact or trying to rescue a friend from a dangerous place.
One common theme is sisterhood. Since they are sisters in the show, a lot of fanfictions explore their relationship further, like how they support each other through tough times.
Fashion is also a big theme. Rarity is all about fashion, and often in these fanfictions, Sweetie Belle either gets involved in Rarity's fashion projects or tries to create her own fashion statements with Rarity's influence. For example, in some stories, Sweetie Belle helps Rarity with a big fashion show in Ponyville.
One great Sweetie Belle and Spike fanfiction is 'The Adventures of Sweetie and Spike'. It shows their friendship as they go on a journey to find a magical gem. They face many challenges together and their bond grows stronger throughout the story.
You can find Sweetie Belle and Spike fanfiction on websites like FanFiction.net. There are numerous stories there, sorted by different categories and ratings. Just search for their names in the search bar and you'll get a list of relevant fanfictions.
One popular one might be 'The Unlikely Friendship' which shows their unique bond growing over time. It has really cute moments where they help each other out in different situations in Ponyville.
One idea could be that Spike and Sweetie Belle team up to put on a play for the Ponyville residents. Spike can use his fire-breathing ability to create special effects, while Sweetie Belle showcases her singing talents.
Another place could be Archive of Our Own (AO3). It has a wide range of fan-created works. Just use the search function and type in 'Sweetie Belle x Spike' and it should bring up relevant fanfictions. Some of them might be really well - written with interesting plotlines.
One popular Spike and Sweetie Belle fanfiction is 'Adventures of Spike and Sweetie'. It's a heartwarming story that shows their friendship as they go on a quest in the Everfree Forest together. The characters are well - written and their interactions are really cute.
Adventure is another common theme. Writers like to send them on exciting quests or exploration in the world of Equestria. For example, they might be on a mission to find a lost magical item or to help a fellow pony in trouble. This gives a lot of scope for action and character development. They learn new things about themselves and each other during these adventures.