Without specific plot details or character information for 'Nerd, 2019', it is not possible to evaluate the film's portrayal of LGBTQ+ characters or themes. Therefore, an assessment of its net impact cannot be made.

Currently, there is not enough information available to assess the film's portrayal of transsexual characters or themes. Without plot details or character descriptions, it is impossible to determine if such elements are present or how they are depicted. Therefore, a comprehensive evaluation of the net impact cannot be made at this time.

Due to the limited information available about the film's plot and specific scenes, it is not possible to determine if any female characters engage in and win close-quarters physical combat against male opponents. No detailed fight descriptions or plot summaries are provided.

The provided information does not indicate if "Nerd, 2019" is an adaptation of existing source material or features legacy characters. Without details on prior established character genders, it is impossible to determine if a gender swap occurred.

There is no information provided regarding the source material for "Nerd, 2019" or any prior established races for its characters. Without this context, it is impossible to determine if any character portrays a different race than originally established.