In addition to Twilight, there could be her pony friends. They might initially be confused or even scared when they discover Twilight's transformation into a changeling. Their reactions and how they come to accept or not accept her could be a major part of the story.
One of the main themes is transformation. Twilight Sparkle's change into the Changeling Queen is a huge transformation, both physically and in terms of her responsibilities. Another theme is leadership. As the Changeling Queen, she has to lead the changelings, which is not an easy task.
There could be some jealous ponies in Ponyville as antagonists. They might not understand Twilight's relationship with the changeling and start spreading rumors. This could create problems for the couple, like making Twilight doubt the changeling or making the changeling feel unwelcome in Ponyville.
Obviously, Twilight Sparkle is one of the main characters. Her friends like Pinkie Pie, Rainbow Dash, etc. might also be involved. They could support Twilight in her gaming adventures or even join in on the gaming fun themselves.
One interesting plotline could be Twilight Sparkle struggling to adapt to the changeling society while still holding onto her own values. For example, she might have to learn their ways of communication which are different from ponies.
Obviously, Twilight Sparkle and Scootaloo are the main characters. Twilight Sparkle is the wise and powerful unicorn (later an alicorn) who has a great knowledge of magic and friendship. Scootaloo is a young and energetic pegasus pony who looks up to the Wonderbolts and is always eager to prove herself.
Well, 'Twilight's Rule as Changeling Queen' is another interesting one. This fanfiction delves deep into Twilight's transformation into the Changeling Queen. It explores how she adapts to her new role, the challenges she faces in ruling the changelings, and how her friendship with the other ponies is tested. It's a long - form story that really takes you on an emotional journey.
Perhaps the changeling is an outcast in its own kind because it has different feelings. It meets Twilight Sparkle during one of her magical studies in a far - off place. Their shared love for knowledge brings them together, and a romantic relationship begins to develop as they explore new magical concepts together.
A likely candidate could be Discord. He is known for causing chaos and mischief. He might pretend to befriend Twilight Sparkle only to betray her at a crucial moment. Another possibility is Trixie. Trixie has been jealous of Twilight in the past and could betray her out of envy.
Most likely Twilight Sparkle is one of the main characters, given that she's in the title. There may also be her friends like Rainbow Dash, Pinkie Pie, Fluttershy, Rarity, and Applejack. They often play important roles in stories related to Twilight Sparkle.
Flash Sentry could be a likely groom. He has shown an interest in Twilight in the past and they have had some interactions that could lead to a romantic relationship. Another option could be a completely new character, perhaps a powerful wizard or a prince from a far - off land who Twilight meets during one of her adventures and falls in love with.