The film "Barbie Fairytopia: Mermaidia" does not feature any identifiable LGBTQ+ characters or themes within its narrative. The story focuses on traditional fantasy elements, friendship, and adventure, without incorporating queer identities or storylines.

The film "Barbie Fairytopia: Mermaidia" does not feature any identifiable transsexual characters or themes. The narrative focuses on magical creatures, friendship, and an adventure to save the ocean, without engaging with gender identity beyond the typical binary representation of its characters.

The film features Elina, a fairy who becomes a mermaid, and the villain Laverna. While Elina confronts male Fungi henchmen, her victories are achieved through evasion, agility, and magical abilities rather than direct physical combat. No female character is depicted defeating male opponents in close-quarters physical fights.

This film is a direct-to-video sequel within an original animated series. All characters are either new creations for this installment or maintain the gender established in prior films of the same series. No characters from external source material or historical figures have had their gender changed.

This animated film features original characters created for the Barbie universe. There is no prior source material or historical record establishing a different race for any character, nor are there instances of returning characters being depicted as a different race than in previous installments.