It varies. Some fanfictions offer unique and imaginative perspectives on regeneration, while others might stick closely to the show's lore. It depends on the author's creativity.
Obviously, the 12th Doctor himself is a central character. Then there's Clara, his companion. Their relationship is often explored during the regeneration process, as she might be there to witness it or even have some influence on how it unfolds. Another common character could be the TARDIS. It's an important part of the Doctor's life, and in fanfiction, it might react in unique ways during the regeneration, like the console lights flickering in a special pattern.
In many fanfictions, the 10th Doctor's emotional journey during regeneration is complex. He not only has to deal with the physical pain of the process but also the emotional turmoil. He may be afraid of what the new version of himself will be like. There are also memories of his past regenerations flooding back, adding to his distress. And his relationships with his companions play a huge role. He might worry about how they'll react to his new form, and whether they'll still be by his side. All these emotions are often explored in great detail in fanfictions.
His companions like Amy Pond and Rory Williams are often involved. They are important as they have been with the 11th Doctor through many adventures and their reactions to his regeneration are crucial parts of the story.
These fanfictions often explore new perspectives and challenges for the Doctor. They might focus on how the female regeneration changes the way she interacts with companions and faces enemies.
The main character would surely be the 10th Doctor himself. His companions, depending on the era, like Rose Tyler or Martha Jones, could also be main characters. They play important roles in how the Doctor adjusts to his new form.
One interesting idea could be exploring the Doctor's internal conflict during the regeneration process. He might be grappling with memories of his past selves and the adventures he had. Another could be how his companions react to the sudden change. They may be in shock or try to help him through the difficult transition.
One interesting idea could be exploring the Doctor's internal conflict during regeneration. He might be grappling with memories and emotions from his 12th incarnation. For example, his relationship with Clara could play a role in how he approaches regeneration, perhaps having visions of their adventures together and feeling reluctant to let go of that part of his life.
One notable thing is the way these fanfics handle the power dynamics. Sometimes they give the female regeneration unique abilities or challenges. Also, the character development can be quite intense and complex.
One of the best things is getting to see new and creative takes on beloved characters. Fanfiction can explore storylines and relationships that the original show didn't have time for.