A likely candidate could be Discord. He is known for causing chaos and mischief. He might pretend to befriend Twilight Sparkle only to betray her at a crucial moment. Another possibility is Trixie. Trixie has been jealous of Twilight in the past and could betray her out of envy.
First, understand their characters well. Twilight is intelligent and studious, while Spike is loyal and eager to learn. Start with a simple scenario like them sharing a book in the library. Build on their conversations, showing how they care for each other's opinions. For example, Twilight could be explaining a complex spell to Spike, and Spike could be asking interesting questions. Then, add some conflict, like a new pony in town who misunderstands their relationship. Finally, resolve the conflict in a way that shows their love for each other, whether it's friendship - love or a more unique bond.
Flash Sentry could be a likely groom. He has shown an interest in Twilight in the past and they have had some interactions that could lead to a romantic relationship. Another option could be a completely new character, perhaps a powerful wizard or a prince from a far - off land who Twilight meets during one of her adventures and falls in love with.
One common theme is the 'outsider' concept. Since Sonic and Twilight are from different fictional universes, they are often seen as outsiders in each other's world. This creates a sense of novelty and discovery in their relationship.
There could be some jealous ponies in Ponyville as antagonists. They might not understand Twilight's relationship with the changeling and start spreading rumors. This could create problems for the couple, like making Twilight doubt the changeling or making the changeling feel unwelcome in Ponyville.
Fanfiction about Twilight Sparkle being banished can also be a vehicle for exploring different relationships. Maybe she meets characters she would never have interacted with in the show. Her banishment could bring out different sides of her personality. She might become more resourceful or develop a stronger sense of self - reliance as she tries to navigate her new situation.
One great 'Twilight Sparkle Fanfiction' is 'A Magical Friendship'. It really delves into Twilight's growth in magic while also strengthening her bonds with her friends. The story has a lot of interesting plot twists and the characterizations are on point.
The main difference is the 'insane' factor. Regular fanfiction might focus on Twilight's normal day - to - day adventures, like studying magic or helping her friends with normal problems. But 'insane twilight sparkle fanfiction' will likely take her into more extreme situations, like having a mental breakdown due to magical overload or some other crazy event.
It could be a pony who is extremely extroverted if Twilight is introverted. Someone who loves chaos and spontaneity instead of Twilight's love for order and planning.
They often interact as teacher and student. Luna, with her vast knowledge of the old magic, can teach Twilight things that are not found in modern magic books. For example, Luna might show Twilight how to communicate with the spirits of the night.