Another plot could involve a dragon that is cursed to transform into a human form until it completes a certain task. The task could be something like restoring a magical artifact or saving a village from a dark force. During this time, it has to adapt to human society, dealing with things like prejudice from those who fear dragons, and finding allies among the more open - minded humans.
Another plot could involve Spyro being cursed to transform into a tiny dragon, much smaller than his normal size. He then has to navigate the world in this new form, facing challenges like being hunted by small predators that were once no threat to him. It would be a story of adaptability and finding strength in a different form.
One interesting plot could be that Twilight's dragon transformation is part of a test by a powerful magical being. In her dragon form, she has to complete a series of challenges in a dangerous dragon - inhabited land. The challenges could be related to controlling her new form, using her dragon - specific powers, and also learning about the history of dragons. This would not only test her physically but also her mental and emotional strength.
One idea could be a human accidentally getting bitten by a vampire during a full moon and slowly transforming while struggling to hide it from their family. Another could be a vampire choosing a human to transform as a way to save them from a terminal illness. And a third could be a group of humans being hunted by vampires and one of them getting turned and having to choose between their old life and their new vampire existence.
One idea could be exploring the mermaid's adventures on land from a new perspective. For example, her discovery of different cultures and how she tries to adapt while still maintaining her unique mermaid qualities. This can be a story of self - discovery and acceptance.
One idea could be a young protagonist who discovers they have a dormant dragon - transformation gene. They start having strange dreams and then one day, during a moment of extreme danger or high emotion, they transform into a dragon for the first time. Their journey could then be about learning to control this new power and finding out the origin of their dragon - like abilities.
One idea could be that a trainer discovers a wounded Celebi. As the trainer nurses it back to health, Celebi, in a show of gratitude, temporarily transforms the trainer into a Pokemon to experience the world from their perspective. Another plot could involve Celebi using its transformation powers to save a group of Pokemon from a natural disaster by changing them into forms that can better survive the situation. For example, turning water - type Pokemon into flying - type Pokemon to escape rising floodwaters.
One idea could be a Vulpix that gets transformed into a different type of Pokemon due to a magical artifact. It then has to learn to adapt to its new form and abilities while trying to find a way to change back. Another plot could involve a trainer who accidentally causes the transformation of their Vulpix and they go on a journey together to figure out how to reverse it.
One idea could be a young trainer discovers an ancient spellbook that has pokemon transformation spells. He accidentally casts one on himself and turns into a Pikachu. Then he has to figure out how to reverse the spell while experiencing the world from a pokemon's perspective.
Well, perhaps a plot where the character's transformation is tied to their emotions in a very unique way. So, when they're extremely angry, they transform into a powerful and somewhat uncontrollable form, but when they're calm and focused, it's a more refined and strategic transformation. And then there could be a quest in the fanfiction to fully master these different states of transformation.
One idea could be the mermaid's transformation into a human having unexpected side effects on her ability to communicate with sea creatures. Since she's now part of the human world, she might find that her once - effortless connection with the underwater beings is fading, leading to a sense of isolation and a longing for her former life.