In tmnt female Leo fanfiction, the theme of empowerment is quite common. It shows how the female Leo overcomes obstacles and proves herself to be just as capable as the male Leo. Another theme is adaptation. She has to adapt to the unique situations and challenges that come her way, whether it's dealing with new villains or changes within the team. And of course, loyalty is a theme, as she remains loyal to her brothers and the cause of protecting New York City.
A big theme in these fanfictions is the struggle for acceptance. The female Leo might face challenges in being accepted as a leader or as a female in a male - dominated group. Friendship is also a common theme, especially her relationships with other characters like Splinter. For example, in some fanfictions, she has to prove herself worthy of Splinter's teachings. Another theme that pops up often is the fight against evil. She uses her skills and wits to battle the bad guys in unique ways.
One common theme is leadership. Since Leo is often seen as the leader, in female Leo fanfiction, it explores how she takes on that role in different ways. Another theme is family. It shows how she interacts with her brothers and how the family dynamic is affected by her being female. Also, self - discovery is a theme, as she figures out her place in the TMNT world.