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This article may contain spoilers.
The main protagonist of the series, Nadia is a 14-year-old girl of mysterious origins. She possesses the Blue Water. With companions Jean, Marie, and King, Nadia aims to find out both where she was born and the true nature of the Blue Water.
In the epilogue, Nadia has married Jean and they have a child.
Nadia is a slim girl with brown skin, teal eyes, and short, blunt-cut purple hair with bangs. She is typically seen in her circus outfit: a white tube top and red vest, a red skirt with white trim and slits up the legs, a burgundy sash, and red lace-up flats. She wears a fair amount of jewelry. Aside from the Blue Water, she wears gold hoop earrings, a three-banded gold choker, gold bracelets similar to her necklace on her wrists and arm, and two white and red hair clips on both sides of her face.
When working on the Nautilus, she made several modifications to the uniform jumpsuit, as it was otherwise too big for her. The midsection of top and the sleeves are ripped off, and the pants converted into shorts with ripped edges.
Nadia is a stubborn girl with few social skills, but she is also an incredibly empathetic person who cares for the well being of others, often before her own. She also possesses the ability to speak with animals. For example, she is able to communicate easily with her lion cub, King. She's a strict vegetarian because of traumatic experiences from her childhood in the circus. Thanks to this, Nadia is easily stressed around meat and abhors the idea of hunting, especially when people take pride in it. Because of her unhappy past, Nadia is even extremely suspicious of all grown-ups—particularly Nemo. As a result of her growing love for Jean, however, she comes to learn valuable lessons about friendship, respect, and trust for those around her.
Nadia has been depressed throughout the series as well, contemplating the meaning of her life and attempting to get rid of the Blue Water despite its value to her. She's irritable and confused, and even attempts suicide at one point.