One common theme is the struggle for acceptance. Since dragons are different from ponies in the MLP world, many fanfics deal with how the dragon OC tries to be accepted by the pony community or vice versa.
Another theme is self - discovery. The dragon OC usually has to figure out who they are and what their place is in the world. They might struggle with their identity as a dragon in a pony - dominated world, and the story is about them finding their true self. This can involve learning about their powers or their heritage.
First, create your original character (OC). Decide on its appearance, personality, and backstory. For example, if it's a unicorn, think about what kind of magic it has. Then, come up with a basic plot idea. It could be an adventure, a friendship story, or something else.
One great MLP EQG OC fanfic is 'The Newcomer'. It tells the story of a unique OC who enters the EQG world and has to adapt to the magical high school setting. The character development is really interesting as we see the OC struggle with fitting in while also discovering their own powers.
Typically, mlp dragon pony fanfic often features unique friendships. Since dragons and ponies are different species in the My Little Pony world, their interactions can be really interesting. For example, they might have to overcome cultural differences.
I'm not sure specifically as I haven't read it. But generally, in MLP (My Little Pony) fanfics, if it's about Twilight as a dragon, it might explore a different form or transformation for Twilight, perhaps with new powers and adventures within the magical world of Equestria.
There's 'A Dragon Among Ponies'. This fanfic focuses on how a dragon OC tries to adapt to the pony society. It shows the cultural differences and the challenges the dragon faces in a very engaging way. It also has some great dialogue that makes the story come alive.
His backstory is also crucial. Maybe he comes from a far - away land in Equestria or has a special talent that sets him apart. You can also give him relationships with the existing MLP characters. For instance, he could be friends with Rainbow Dash and they have an adventure together.
One common theme is self - discovery. The OC pegasus often has to figure out its own strengths and weaknesses, like in 'The Lone Pegasus OC' where the character spends a lot of time exploring what makes it unique. Another theme is friendship. For example, in 'Pegasus OC and the Gang', the OC forms deep friendships with other ponies and they all support each other through various difficulties. Adventure is also a popular theme, such as in 'Adventures of the Pegasus OC' where the OC embarks on exciting quests across Equestria.
Next, integrate the OC into the existing EQG world. Have them interact with the known characters. They could befriend Twilight or have a rivalry with Sunset. Also, think about the EQG school setting. Maybe your OC has a hard time in a particular class or excels in magic duels.