The evaluation of 'Mikaela' (2020) regarding LGBTQ+ characters and themes could not be performed. The prompt did not include any specific film content or plot details necessary for analysis, thus the portrayal is categorized as N/A due to lack of information.

Based on the information provided, the film 'Mikaela' does not feature identifiable transsexual characters or themes, therefore no specific portrayal could be evaluated.

Information regarding the film's plot and combat scenes is not available, preventing an analysis of whether female characters engage in and win close-quarters physical combat against male opponents.

The film "Mikaela" (2020) appears to be an original short film with no readily available information indicating it is an adaptation of existing material or features historical figures. Therefore, there is no basis to identify any character as having a pre-established gender that was subsequently changed.

No information is provided regarding the source material, characters, or their established racial identities for "Mikaela" (2020). Without a baseline for comparison, it is impossible to determine if any race swaps occurred.