Currently, there is not enough information available about the film's plot or characters to assess its portrayal of transsexual individuals or themes. Without specific details regarding the narrative or character arcs, a determination of positive, negative, or neutral impact cannot be made.

The movie does not contain any action or adventure elements.

There is no information provided to suggest that "Melanie, 2019" is an adaptation of existing source material or features characters established in prior works or history. Therefore, no gender swap can be identified.

There is no information provided to indicate if "Melanie, 2019" is an adaptation of existing material or based on historical figures. Without a source baseline for character races, it's impossible to determine if a race swap occurred.