Without specific plot details or character information for "Miraculous Detectives Father and Son: Lost in a Rainy Night," it's impossible to evaluate its portrayal of LGBTQ+ characters or themes. Therefore, the film is rated N/A for no identifiable depiction.

No information was provided in the prompt to assess the film's portrayal of transsexual characters or themes. Therefore, an evaluation of its net impact on transgender representation could not be made.

The movie does not contain any action or adventure elements.

This animated film is based on the 'Old Master Q' comic series. All major characters, including Old Master Q and Big Potato, retain their established genders from the source material. There are no instances of a character canonically established as one gender being portrayed as a different gender.

This Chinese animated film is an adaptation of the Chinese comic book series "San Mao." The characters, including San Mao and his father, are consistently depicted as Chinese in both the original source material and the film, with no changes in their established race.