Characteristics can vary widely. Some fanfics may give her a more feminine sense of style while still keeping her mechanical and flying skills intact. She could be more empathetic, which leads to her being a better mediator between the often - bickering Sonic and other characters. In some, she may have a more delicate appearance but a strong will, much like the male version of Tails but with a different aesthetic.
Well, it could be that in this fanfiction, the character Tails is reimagined as a girl. Maybe it's a creative way to explore different aspects of the character, like how she would interact in the story's world, or it could be a way to introduce new relationships or storylines.
A possible plot could focus on how Tails' daily life changes. As a girl, she might have to deal with different social expectations. Her hobbies and interests could shift slightly. For example, she might be more interested in certain types of fashion or more nurturing activities. Her relationship with Amy could also change, perhaps they become closer friends as they share more 'girly' things. And Tails' mechanical skills might be seen in a new light, as she uses them in a different way to solve problems in her new form.
One popular 'tails is a girl' fanfiction might be the one where she goes on an adventure in a magical forest. It's full of interesting characters she meets along the way.
You can try fanfiction websites like Archive of Our Own (AO3). It has a vast collection of fanfictions, and you might be able to find some great 'tails is a girl' ones by using the search function.
I recommend the following two novels to you. They are both novels about men turning into girls. They are both urban novels: " Transformed City Beauty " and " Starting to Be a Girl Today." " Transformed City Beauty " told the story of a boy who became a girl after entering the entertainment industry, while " Starting to Be a Girl Today " described a male protagonist who suddenly became a woman after getting drunk and experienced various different lives and encounters. These novels are full of interest and imagination. I hope you will like them.