Hardly. While fanfiction can cover a wide range of themes, abuse is not a typical or popular one, especially when it comes to well - liked characters like Yukio and Rin. The majority of fanfiction writers are interested in creating engaging stories that build on the existing relationships in a positive manner. Depicting abuse would not only be out of character for most interpretations but also not well - received by the general fanfiction - reading audience.
Well, Yukio acquires powers in the manga. These powers play a crucial role in shaping the plot and his character arc. They give him new abilities and challenges to face.
If Yukio was a girl, it could open up new storylines and themes. For example, how society perceives her or how her gender influences her goals and choices could be explored in the fanfic.