One interesting storyline could be about an OC pony who discovers a hidden magic within themselves and has to learn how to control it to save their friends. Another might be an OC from a different land coming to Equestria and having to adapt to the new culture while also bringing something unique to it. And there could also be a story where an OC pony has a dream of uniting all the different pony tribes through music or art.
There could also be a story where the ponies are dragged into a war in a different dimension. They have to adapt to new environments and strange enemies. This would show their ability to be flexible and how they can form new alliances in unfamiliar situations.
One interesting storyline could be Goku accidentally landing in Equestria. He might be confused at first by the colorful ponies and their magic. But then, he could start to learn about their way of life and use his strength to help them out, like when facing some big threats that the ponies can't handle on their own.
One interesting storyline could be Luna and Supernova teaming up to save Equestria from a new and powerful dark force. They might use their combined magic to overcome the threat.
Maybe the OC has a special mission and as they journey through Equestria, they meet various ponies who decide to join their 'harem'. The OC could be on a quest to find a long - lost magical artifact, and during this journey, they encounter ponies from different regions and backgrounds. These ponies see the OC's determination and leadership, and they are drawn to them, creating a harem - like group that helps the OC in their mission.
Maybe a changeling OC who gets lost in Equestria during a mission and is found by one of the main ponies. The OC could initially be distrusted, but as the story progresses, they form an unlikely friendship. The OC could then start to learn about friendship and love from the ponies, which would change their view of the world and themselves. For example, they could start to see that there are better ways to get the energy they need than stealing love.
You could create an Alicorn OC who was born without wings but has an incredibly strong horn magic. She is shunned by some of the other Alicorns at first. But through her determination and kindness, she proves that she is just as worthy. She might go on a journey to discover the origin of her unique situation and along the way make friends with all kinds of ponies.
One interesting story could be about an Alicorn OC who discovers a hidden magic in Equestria that no one else knew about. This Alicorn uses this magic to bring harmony to a part of Equestria that was facing some sort of turmoil. It could involve her making new friends along the way and learning important lessons about friendship and responsibility.
One interesting storyline could be about the ponies going on a magical adventure to find a lost crystal that powers their whole land. They face various challenges like crossing a treacherous river and outsmarting a mischievous imp along the way.
A great story idea could be a genius OC pony who is an expert in ancient pony history. They discover long - lost spells or artifacts that were thought to be only legends. This OC could go on adventures to find these relics, facing challenges along the way. Their knowledge might be the key to solving a big problem in present - day Equestria, like an impending disaster that only an old - fashioned spell can prevent. Along the way, they might make new friends and enemies as they dig deeper into the secrets of the past.
One idea could be a female OC who is a talented artist in Equestria but is too shy to show her work. She then meets one of the main ponies like Twilight Sparkle who encourages her to share her art with the world. Another could be a female OC from a different land who comes to Equestria to learn about friendship and has to overcome cultural differences.