There might be a fanfic where Twilight and Flash are in a competition at Canterlot High. It could be a talent show or a sports competition. They start off as rivals but then realize that they can learn a lot from each other. As the competition progresses, they form an unlikely friendship that is really inspiring.
A really popular one is the fanfiction that focuses on Twilight's relationship with her friends in the Equestria Girls setting. It shows how they support each other through school problems, boy - girl drama, and still manage to keep their magical bond intact.
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.
One popular fanfiction could be 'Twilight and Timber's Adventure'. It might have them going on an exciting journey through different dimensions in Equestria Girls' world. They could face challenges together and their relationship could develop in interesting ways.
Twilight Sparkle was in her room, deeply engrossed in a book. Her friends entered quietly. Pinkie Pie then quickly started tickling Twilight's ears. Twilight was so surprised that she dropped her book and started laughing. She tried to use her magic to stop the tickling but couldn't focus enough. It was a hilarious sight as Twilight was usually so composed.
Some fanfictions have Twilight being a detective in the Equestria Girls world. She uses her intelligence to solve mysteries around the school, like missing items or strange happenings. It gives a whole new perspective on her character.
In the fanfiction, her character could be developed by giving her new challenges related to her futa form. Maybe she has to learn how to control new powers or abilities. This could lead to her making mistakes and learning from them, which is a great way to develop a character. She could also have internal conflicts, like whether to embrace this new form completely or try to hide it, and how these decisions shape her personality.
One possible plot idea could be Twilight Sparkle discovers a new magic power in the Equestria Girls world that is related to her futa form. This power could help her solve a mystery or overcome an enemy. Another idea is that she has to deal with the challenges of being different in this form while still trying to fit in with her friends. Maybe she could use her unique abilities to help her friends in unexpected ways, like using her newfound strength to protect them from a bully or a dangerous situation.
You can start by checking out popular fanfiction websites like FanFiction.net or Archive of Our Own. Just type in 'MLP Equestria Girls Twilight and Timber' in the search bar and you'll get a list of relevant fanfictions.
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.