The film 'Aristotle and Dante Discover the Secrets of the Universe' does not feature any identifiable transsexual characters or themes. Its narrative is centered on the romantic relationship and self-discovery of two gay teenage boys, Aristotle and Dante. Therefore, an evaluation of the portrayal of transsexual characters or themes is not applicable to this film.

The movie does not contain any action or adventure elements.

The film is an adaptation of a novel where the main characters, Aristotle and Dante, are canonically male. The on-screen portrayals align with their established genders, and there is no indication of any significant character undergoing a gender change from the source material.

The film adapts a novel where the main characters, Aristotle and Dante, are explicitly Mexican-American. The actors cast in these roles, Max Pelayo and Reese Gonzales, are also of Mexican descent, maintaining the characters' established racial background from the source material.