Identity change. As the transformation occurs, the character's identity might shift. They may no longer be the same person they were before. In 'Fullmetal Alchemist', Edward's journey through various alchemical trials and his physical and mental changes are part of his identity transformation.
Survival in a new or changed world. After the cataclysmic event that causes the transformation, the characters have to find a way to survive in a world that is often very different from what they knew. This is a common theme in many such light novels, like in 'Tokyo Ghoul' where the main character has to adapt to a world filled with ghouls after his own transformation.
Power acquisition. Often, the main character starts from a relatively weak state and then undergoes a cataclysmic transformation that gives them great power. For example, in 'One Punch Man' (which can be considered in this genre to some extent), Saitama's transformation into an extremely powerful hero is a key part of the story.
Another great one is 'Re:Zero − Starting Life in Another World'. The protagonist experiences a cataclysmic transformation as he repeatedly dies and has to relive his experiences in a new world. It's a story full of mystery, growth, and unexpected turns.
Identity crisis. The transformation makes the character question who they are. Are they still the same person inside? In 'Overlord', Momonga has to deal with his new identity as a powerful being in a game world and how that differs from his human self. He has to adapt to the moral and ethical implications of his new form and power.
Family acceptance or lack thereof is also a major theme. Many ftm transformation fictions show how families react to the news of their child's transformation. Some families are supportive, while others struggle to understand or even reject the transgender individual. For example, in some stories, parents might initially be against their child's transition but eventually come around through a process of learning and growth. Another important theme is friendship. Transgender characters in these fictions often have to deal with how their friends will react. Some friends might be very accepting and stand by them through the transformation process, while others might distance themselves. And finally, there is the theme of facing society's prejudices. Transgender people often face discrimination in society, and ftm transformation fictions often explore how the characters navigate through a world that might not be very accepting of their identity.
The theme of acceptance is also prevalent. In many transformation stories, the characters around the transformed one need to accept the change. In 'A Midsummer Night's Dream', the other characters have to accept Bottom's strange new appearance. And finally, the theme of the unknown. Transformation often brings the unknown into the story, as the characters don't know what will happen next or how long the transformation will last.
In 'female transformation fanfic', a prevalent theme is the struggle with identity. The transformation makes the female character question who she is now. Another common theme is the exploration of new possibilities. Since she has changed, there are new paths and opportunities for her. Additionally, the theme of growth is often present, as she develops as a person during and after the transformation.
One common theme is self - discovery. The character often goes through a process of realizing their true gender identity, which is different from what they were assigned at birth. It's about finding who they really are inside.
One common theme is power evolution. Characters often transform to gain new and stronger powers. Another is identity exploration. Through transformation, they might question who they are. For example, a character might transform into something that challenges their previous self - image.
Another theme is the connection between humans and nature. When a human turns into an animal, it shows that there are aspects of the animal world within us. Like in Native American stories where a person might transform into an eagle to gain wisdom, it shows the respect and relationship with nature.
In 'rwby transformation fanfic', the theme of acceptance is quite prevalent. The character who has transformed may look different or have different abilities, and they have to deal with whether their friends and allies will still accept them. Also, the theme of identity crisis is common. They might question if they are still the same person they were before the transformation. Additionally, some fanfics explore the theme of sacrifice, where the transformation is a result of sacrificing something in order to gain the new form.
A lot of transformation stories have the theme of facing challenges. The transformation itself is a big challenge, but then there are other challenges that come with it. For example, if a person transforms into a bird, they not only have to learn to fly but also deal with predators. Also, the theme of relationships is important. The transformation can affect relationships with family, friends, and lovers, and how these relationships are navigated can be a key part of the story.