The theme of adaptation is quite likely. The man turned Rainbow Dash has to adapt to a completely different physical form, with wings and a pony - like body. In the orphanage, he or she also has to adapt to the living conditions, the people around, and the new social dynamics. Moreover, there could be a theme of hope. Despite the difficult situation of being in an orphanage, the character, with the spirit of Rainbow Dash, may find hope and strive for a better future.
There could be a theme of growth and self - discovery. As the character is reborn as Rainbow Dash, they will have to learn about the new abilities and characteristics of this form. Also, in the orphanage, they may face challenges that force them to grow and understand themselves better. It could also touch on the theme of friendship, as Rainbow Dash is known for her friendships in the My Little Pony world, and the character may form new bonds in the orphanage environment.
I'm not sure of specific 'Man reborn as Rainbow Dash in orphanage' fanfictions off the top of my head. But you can try searching on fanfiction websites like Fimfiction. They usually have a wide variety of My Little Pony - related fanfictions, and you might be able to find one with that particular plot there.
In 'sonic and rainbow dash kiss fanfiction', there might be a theme of adventure and discovery. Their encounter could be part of a larger adventure where they have to work together. During this time, they learn about each other's cultures and values. The kiss could be a celebration of their newfound understanding. Additionally, there could be a theme of overcoming differences. Since they are so different in appearance and origin, the story could focus on how they look past these differences and find common ground, with the kiss being a sign of their connection despite all the disparities.
One common theme might be self - discovery. As the man turns into a filly Rainbow Dash, he has to discover new aspects of himself in this new form. Another could be friendship, as Rainbow Dash is a character associated with strong friendships in the My Little Pony universe.
One common theme is the development of their relationship. It often starts with some sort of encounter, like at a racing event. Then they gradually discover their feelings for each other.
Friendship is also a big theme. They are often depicted as friends who support each other through thick and thin. In fanfictions, they might help each other out when one of them is facing a personal or professional crisis.
The theme of growth is quite common in 'Rainbow Dash Hurt' fanfiction. Whether it's physical or emotional hurt, it serves as a catalyst for her to grow as a character. This could mean becoming more mature, learning new skills, or developing a deeper understanding of the world around her. Additionally, some fanfictions may explore the theme of sacrifice, where Rainbow Dash has to sacrifice something in order to recover from the hurt.
Friendship is a very common theme. Since they are both characters from the same universe, their friendship is often explored, like how they support each other through tough times.
A common theme is adventure. Since both Sonic and Rainbow Dash are known for their adventurous spirits, many fanfictions involve them going on quests or exploring new places together.
One possible plotline is that they meet due to a dimensional rift. Sonic is zapped into Rainbow Dash's world and they have to work together to find a way to send Sonic back. Along the way, they encounter various threats and have to use their combined skills to overcome them.
Friendship is also a big theme. Since she's part of the Mane Six, fanfics often explore how her friendships develop and are maintained. It could be about how she helps a friend in need or how her friends support her during a difficult time.