Another element could be the origin of this relationship. Maybe there was a magical transformation or a special event that made Flurry Heart Spike's mom. This would be important as it sets the foundation for the story. Also, the reactions of other characters in the story to this relationship could be a key element. Do they support it? Are they against it? These reactions can drive the plot forward.
I'm not entirely sure which specific 'flurry heart is spikes mom story' you are referring to. There could be many fictional or fan - made stories with such a concept. It might be from a particular fandom or a creative work that I'm not familiar with.
Adventure is often a theme. The two characters could embark on all sorts of adventures, whether it's exploring a new part of Equestria, going on a quest to find a lost relic, or facing a new threat to the land. Their adventures would not only be exciting but also help them develop as characters and further their relationship.
One possibility could be a story about Twilight Sparkle teaching Flurry Heart about magic. Since Twilight is very knowledgeable in magic, she could be showing Flurry Heart some basic spells or introducing her to the concept of different magical elements. For example, they could go on a journey through Equestria to find a special magical artifact that can help Flurry Heart control her powerful magic better.
Alex in this fanfic could be a really unique character. Maybe Alex is a fan of both Equestria Girl and Worm, and through some magical or scientific accident, gets transported into a world that combines the two. It would be a wild adventure for Alex to navigate the different rules and cultures of both universes.
I'm not sure there's a specific, pre - existing fanfic about Alex and an Equestria Girl in the Worm universe. It could be a very unique crossover idea. Maybe someone would write it as a story where the magical elements of Equestria meet the superpowered and often gritty world of Worm. They could have all sorts of adventures and face different challenges that combine the characteristics of both universes.
One common theme is her growth and development. Since she's a young alicorn, many fanfictions explore how she learns to control her powers and deal with the responsibilities that come with her status. Another theme could be her family relationships, like her bond with her parents, Twilight Sparkle and her husband.
The Equestria Girl cartoon story often involves the main characters from Equestria being transformed into human-like girls in an alternate world. They face various challenges like fitting in at school, dealing with mean girls, and also using their pony - like qualities such as friendship and magic (in some cases) to overcome difficulties.
One great fanfic could be 'Rainbow Dash's New Adventure in Equestria Girl World'. It might show Rainbow Dash facing new challenges in the human world while still maintaining her pony spirit. Another could be a story where she teams up with other Equestria Girls to save their school from some kind of threat. There are also fanfics that focus on her friendship with the other characters in this new setting, like how she bonds with Pinkie Pie in the human form.
Twilight Sparkle is one of the main characters. She is very intelligent and often leads the group. Rainbow Dash is also important, she's really athletic and brave. Then there's Pinkie Pie, who is always full of energy and loves to have fun. Fluttershy, a shy but kind - hearted character, and Rarity, who is into fashion and elegance.