A great plot for MLP Friendship Games fanfiction could be that there's a malfunction in the portal between Equestria and the human world during the games. As a result, some of the pony versions of the characters start appearing in the human world during the games. This creates chaos as they don't understand the human world rules and the Equestria girls have to quickly teach them while still trying to win the games.
Well, you could write about a time - travel plot in an MLP School of Friendship fanfic. For example, some of the ponies accidentally go back in time to when the school was first being built. They meet the founders and learn about the original intentions of the school. Or perhaps a story where a spell goes wrong and it makes some of the ponies swap personalities. They then have to figure out how to reverse the spell while also learning more about each other. And also, a story about a lost friendship diary that holds the secrets of the early days of the school, and the ponies go on an adventure to find it.
One idea could be that the ponies from different pony tribes are forced into the Hunger Games arena. For example, the earth ponies might use their strength and connection to the land to find food and build shelters. The pegasi could use their flying abilities to gain a strategic advantage in the arena, like scouting from above. And the unicorns could use their magic for various things like defense or creating illusions to mislead opponents.
Perhaps there is a portal that connects Cybertron and Equestria. Some ponies accidentally end up on Cybertron and are shocked by the mechanical world. The Transformers have to help them get back home. Meanwhile, some Autobots are curious about the ponies' world and decide to accompany them. This leads to a cultural exchange of sorts between the two groups, with lots of misunderstandings at first but then growing respect and friendship.
One idea could be Discord causing chaos in Equestria that only the Mane 6 can stop with their unique friendship powers. For example, he might mix up the elements of harmony, and the ponies have to go on a quest to put them back in order while dealing with Discord's wacky challenges.
One idea could be Sonic and Tails going on a journey to find a rare power - up that could save their world. Along the way, they face many challenges and Sonic always protects Tails, which deepens their friendship. Another plot could be Tails getting lost in a mysterious forest. Sonic searches for him non - stop, and when he finds Tails, Tails realizes how much Sonic truly cares for him.
One idea could be that Harry Potter and his friends accidentally end up in the world of My Little Pony. They could learn about the magic of friendship in Equestria, which is different from the magic they know in the wizarding world. Maybe they help the ponies fight a dark force using their unique spells.
Well, perhaps there could be a crossover where Scooby and Shaggy accidentally eat some magic cupcakes in Equestria that give them the ability to talk to the ponies in a special way. Then they discover that there is a mystery surrounding a disappearing magical element in Equestria. The rest of the Mystery Inc. gang shows up to help, and they all join forces with the ponies like Rainbow Dash and Fluttershy to find out what's going on and save the day.
One plot idea could be that Smolder and Ocellus have to work together on a school project in the School of Friendship. They initially have different approaches due to their different species' natures, but as they spend more time together, they learn from each other and form a strong friendship that might turn into something more. For example, Smolder's more straightforward and bold attitude could inspire Ocellus to be more assertive, while Ocellus' creativity and knowledge of magic could help Smolder in unexpected ways.
Well, perhaps in this fanfiction's alternate universe, the Mane 6 are all from different species. Rainbow Dash could be a griffin, and they have to overcome the prejudices between their species to form their friendship. It could also be that they are in a post - apocalyptic Equestria, and they are on a quest to find the elements of harmony which have been scattered and lost.
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.