Due to the complete absence of information regarding the film's plot, characters, or themes, it is not possible to determine if LGBTQ+ characters or themes are present, or to evaluate their portrayal. Therefore, an assessment of the net impact cannot be made.

Currently, there is not enough information available about the film 'Veneno, 1952' to assess its portrayal of transsexual characters or themes. The provided details, including cast and basic movie information, do not offer any plot points or character descriptions relevant to this evaluation.

The movie does not contain any action or adventure elements.

There is no information provided regarding the source material, character names, or plot details for 'Veneno, 1952' to determine if any character's gender deviates from a previously established canon or historical record.

The provided information for "Veneno, 1952" does not include details about source material, historical figures, or prior canonical depictions of its characters. Without this context, it is impossible to determine if any character's race was changed from an established baseline.