Well, a cool concept would be an MLP and Studio Ghibli - style anime crossover fanfic. Picture the ponies in the beautiful, dreamy landscapes of a Ghibli movie. They could interact with the unique characters in those worlds, like the forest spirits in 'Princess Mononoke'. Or perhaps they end up in the floating city of 'Laputa' and have to figure out how to get back home while also dealing with the mysteries there.
One interesting concept could be the combination of Sonic's speed and the magic in My Little Pony world. For example, Sonic might use his speed to traverse the magical landscapes of Equestria faster than anypony. Another concept could be the interaction between Sonic's friends like Tails and the ponies. Tails' intelligence could be put to use in solving problems that the ponies face in their magical realm.
One interesting concept could be the combination of the magical elements from My Little Pony with the diverse Pokémon species. For example, imagine a Pony using Pokémon moves in a unique way that combines their own natural magic. Another concept might be the interaction between the different characters from both universes. Ponies and Pokémon trainers could form teams and go on adventures together, facing challenges that require both the Pony's charm and the Pokémon's strength.
Some concepts include the exploration of new places. Humans in Equestria would likely be curious about all the different regions, like Canterlot or Ponyville. They would experience the unique landscapes and climates. There's also the concept of how humans are perceived in Equestria. Are they seen as strange or exotic? And how do they fit into the social hierarchy? Do they have to abide by the same rules as ponies? It's all very fascinating to think about.
One idea could be that the ponies somehow end up at Hogwarts. Maybe Twilight Sparkle could be mistaken for a new kind of magical creature and studied in the Care of Magical Creatures class. The ponies' unique magic could interact with the wizarding magic in unexpected ways, like their friendship magic causing some spells to be more powerful or have different effects.
Well, in 'pokemon mlp crossover fanfic', a cool idea is the crossover of the evolution concept. Pokemon evolve in different ways, and in MLP, the characters grow and develop too. So, it could be interesting to see how a Ponyta (a Pokemon) might interact with the ponies in MLP during its evolution process. Also, the idea of Pokeballs in the MLP world is fascinating. How would the ponies react to the technology of capturing creatures in a small ball?
There could be a fanfic where a Woodentoaster - inspired character enters the MLP universe. This character might bring new magic or a different perspective to the pony world, leading to all kinds of interactions with the main MLP characters like Twilight Sparkle and her friends.
One interesting concept could be the fusion of different pony characters' personalities. For example, a fusion between a shy pony and a bold pony might result in a character with a unique blend of cautiousness and fearlessness. Another concept could be the fusion of different magic abilities. It can create new and powerful magic that has never been seen before in the My Little Pony world.
One interesting concept could be the re - imagining of the cute and colorful My Little Pony world with a darker, demonic twist. It might involve ponies having to face new and more menacing threats from demonic forces.
In My Little Pony reaction fanfiction, a common concept is the ponies' reactions to challenges. When faced with a difficult task like saving Equestria from a new threat, each pony's reaction shows their unique personality. Fluttershy might be initially timid but find her courage over time. Also, their reactions to friendship issues are interesting. If there's a rift between friends, they could have various reactions from sadness to determination to fix things.
One interesting fanfic could be about a My Little Pony character who is a huge Michael Jackson fan. In this story, the pony tries to incorporate MJ's dance moves into their own performances in Ponyville. They might hold a special concert where they do the moonwalk and other iconic MJ dance steps, much to the amazement of the other ponies.