In a fanfic, it could be that an alien race in the XCOM universe has a connection to the magic in the Equestria Girls' world. The Equestria Girls must team up with XCOM to stop this alien race from using the magic for evil purposes. The girls would have to adapt to the more militaristic and high - tech environment of XCOM, and XCOM would have to understand the power of magic and the different personalities of the girls.
One possible plot could be that the Equestria Girls characters somehow get transported into the XCOM universe. They then use their unique pony powers, like Twilight's magic or Rainbow Dash's speed, to help XCOM in their fight against the alien invaders. For example, Twilight could use her magic to disrupt alien technology.
Well, perhaps the XCOM organization discovers a portal to the Equestria Girls' world. They recruit some of the girls to join their ranks. The girls bring their own style of combat and friendship to the XCOM team. They might teach XCOM soldiers about loyalty and teamwork in a new way, while also learning about advanced human technology and combat strategies from XCOM.
I think Twilight Sparkle would be really interesting. Her vast knowledge of magic could be used in unique ways in the XCOM universe. She could analyze alien technology and find ways to counter it with her spells. Also, her leadership skills from Equestria could be applied to XCOM operations.
One interesting plot point could be the culture shock the Equestria Girls experience when they first arrive in Equestria. They might be amazed by the magic that is so commonplace there but strange to them. Another could be their interactions with the ponies. For example, they might have to learn new ways of communication and social norms.
Well, it could be a story where the Equestria Girls are magically turned into babies and have to wear diapers. They then go on a journey to find a way to reverse the spell while dealing with the challenges of being in a baby state, like learning to crawl and communicate in a more basic way.
It could be about a new magic that allows the characters to literally share tongues, like a form of communication or power transfer. Maybe it's a strange and mysterious power that they have to figure out how to control.
The plot is mainly about the pony - turned - human girls in Equestria Girls Story. They experience adventures in their human forms. There are elements of friendship, like how they support each other through various difficulties. Also, there are often antagonists who try to disrupt the harmony among them or steal the magic they possess.
One idea could be an OC who is a new student at Canterlot High. She has a unique power related to music, like she can make people feel different emotions through her singing. And she gets involved in a battle of the bands where there's some sort of mystery or magic influencing the competition.
Well, they could end up in a magical realm together. In this realm, their powers are enhanced or changed. They have to rely on each other to find their way back home. Twilight's knowledge of magic and Flash's quick thinking would be key in this adventure.
The main characters are likely to be the Equestria Girls themselves. Twilight Sparkle from the human world would be a central figure as she often takes the lead in many situations. Then there are her friends like Rainbow Dash, Pinkie Pie, etc. Also, the pony versions of these characters might play important roles as they interact with their human counterparts.
Perhaps the story could revolve around Fem Harry's struggle to adapt to the very different culture in Equestria. She might have to learn how ponies communicate, their social norms, and at the same time, use her own unique skills from her original world to help the ponies in some way. For example, if she was good at problem - solving in her own world, she could use that to solve a mystery in Equestria that was baffling the ponies.
Maybe there's a villain from the MLP world that follows them into the Equestria Girls world. The girls then have to team up with their Equestria Girls counterparts to defeat this villain. They could combine their different skills, like the pony Rainbow Dash's speed in the air and the Equestria Girls Rainbow Dash's skills on the track team.