Based on available plot summaries and character descriptions for 'The Nigger' (1990) directed by Amir Shervan, there are no identifiable LGBTQ+ characters or themes present in the film's narrative. Therefore, an evaluation of its portrayal of LGBTQ+ elements is not applicable.

The film "The Nigger" (1972) does not appear to feature any identifiable transsexual characters or themes. Its narrative focuses on a different subject matter, and no information suggests the presence of transgender representation within its plot or character arcs.

The movie does not contain any action or adventure elements.

There is no evidence that "The Nigger" (1973) is an adaptation of source material with pre-established characters or based on historical figures. Therefore, no characters could have been gender-swapped from prior canon or history.

No source material or prior character canon is provided for 'The Nigger' (1973). Without a baseline for established character races, it is not possible to determine if any character portrayal constitutes a race swap.