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.
An interesting plot for an MLP School of Friendship fanfic could involve a group of misfit students who form their own club within the school. They feel left out by the more popular groups and friendship circles. But as they work together on their club projects, they discover that their differences are actually their strengths. They then start to influence the rest of the school in positive ways, showing that all kinds of friendships are valuable. You could also have a story where an old enemy of the school tries to undermine the teachings of friendship. The ponies must use their new - found knowledge and strong friendships to defeat this threat. Additionally, a fanfic could focus on a friendship exchange program where ponies from different regions come to the School of Friendship, leading to a clash of cultures and a deeper understanding of friendship in the end.
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.
One idea could be a Beezen character in the MLP world having to adapt to the magic there. Maybe they start off as an outsider and gradually learn to use the magic for good, like helping ponies build better hives or something.
One idea could be a wedding between two ponies from different tribes, like a Pegasus and an Earth pony. They would have to overcome the differences in their cultures and traditions. For example, the Pegasus might have a flying ceremony while the Earth pony has a more grounded celebration. Another plot could involve a wedding planner pony trying to create the perfect wedding but facing all sorts of comical disasters along the way, like the flowers not arriving or the cake getting ruined.
A simple yet interesting plot could be that Spike eats something he shouldn't have and gets sick. For example, he might have eaten a magical plant that gives dragons a stomachache. His friends then have to figure out how to make him better. Rainbow Dash could fly around to find an antidote, while Rarity could sew him a warm blanket to keep him comfortable.
One idea could be an alternate universe where the ponies have different elemental powers. For example, instead of Twilight Sparkle being a unicorn with magic related to friendship, she could control time. This would change the entire dynamic of the stories and the relationships between the ponies.
One idea could be that all the ponies from different tribes come together to face a final, great evil that threatens Equestria. They combine their unique magic and skills to defeat it and in the process, they create a new era of harmony where all differences are truly celebrated.
One idea could be that the ponies from MLP accidentally enter the Pokemon world through a magical portal. They team up with some Pokemon trainers to stop an evil team that's trying to use both pony magic and Pokemon power for their own bad deeds. Another plot could be a Pokemon tournament where ponies are allowed to participate using their unique abilities as if they were Pokemon. For example, a Pegasus pony could use its flying skills in a battle like a Flying - type Pokemon.
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.
One idea could be that Discord causes chaos in Equestria that the MLP characters have to solve in a really wacky way. For example, he might turn all the clouds into cotton candy and the ponies have to figure out how to make it rain again without making a huge mess. Another plot could involve Discord getting his powers mixed up with a unicorn's magic and they have to work together to undo it. Maybe he accidentally gives Twilight Sparkle the power to turn things into random objects every time she tries to use her normal spells.
Well, a cool plot for an MLP Battle Force 5 fanfic could be that there's a strange energy wave that disrupts both the MLP world and the Battle Force 5 world. The ponies and the Battle Force 5 members start having strange abilities or problems because of it. They then have to figure out the source of this energy wave, which leads them on an adventure across both worlds. Along the way, they learn about each other's cultures and strengths, and in the end, they manage to stop the energy wave and become friends. It could also involve some of the ponies learning to drive the Battle Force 5 vehicles in a really funny way.