Nadia: The Secret of Blue Water does not feature any identifiable LGBTQ+ characters or themes. The story's focus remains on its adventure, sci-fi elements, and the development of its predominantly heterosexual relationships, resulting in no portrayal of queer identity.

Nadia: The Secret of Blue Water does not feature any identifiable transsexual characters or themes. The narrative primarily focuses on adventure, scientific discovery, and interpersonal relationships, without exploring transgender identities or experiences within its storyline or character arcs.

The show features several capable female characters, including Nadia, Grandis, and Electra. While they participate in various action sequences and demonstrate resilience, there are no clear instances where a female character defeats one or more male opponents in direct, skilled physical combat using hand-to-hand or melee weapons.

Nadia: The Secret of Blue Water is an original anime series. Its main characters were created for the show and do not have prior canonical or historical gender establishments that were altered for this production. Therefore, no gender swaps occurred.

Nadia: The Secret of Blue Water is an original anime series. Its characters, including those inspired by Jules Verne, were created or reinterpreted for this specific production without prior established racial depictions that were subsequently changed.