Nixie is adventurous and fun-loving to the point that she sometimes gets herself in trouble, acting before she thinks. It's Nixie's mischievousness that helps lead to disaster for her, Sirena, and Lyla when they accidentally let Zac into the Moon Pool.
Nixie thinks that both, Sirena and Lyla, could afford to lighten up. Since she was a hatchling, she's been obsessed with land-dwellers, and has spent hours watching them from the beaches. Because of this, she is more familiar with the way of humans. That said - her knowledge of social human skills is sometimes patchier then she would like to admit - and though Nixie throws herself into life on land, she often gets things wrong - much to the amusement of the other mermaids. However, after the events of the Trident with Zac verses her friends and her, Nixie decides to leave Mako and go back to the pod again with Lyla and left Sirena, who wanted to stay on land.
Nixie is a beautiful teenage mermaid, with wavy brown hair and clear blue eyes. She also has light skin with a couple small birthmarks on her face.
Nixie possesses the ability to transform into a mermaid ten seconds after at the touch of water. She turns back into a human a few minutes after she is out of the water and when the water on her has fully dried. Once her body is completely dry, her human form reverts back to what she appeared to be before her mermaid transformation.
Nixie has the ability to swim at super speed of 600km/h, hold their breath for more than fifteen minutes, and possibly dive at a depth lower than any ordinary human being.
In "Dolphin Tale", Joe, David's brother, started chasing Nixie when she was swimming and she hid in the canal. She got her tail stuck in the nets and turned herself invisible so anyone looking wouldn't see her.
Nixie is shown using this power in "Battlelines" to create a storm in a bottle and make it rain over Zac.
As a part of Atmokinesis.
Nixie used this power to shrink Sirena's vocal chords.
The image gallery for Nixie may be viewed here.
The name, Nixie, refers to a magical water creature similar to a mermaid called a Melusine or Neck. The Melusine are often depicted as having two tails. Also, Nixie is the name of a different Germanic mermaid shapeshifter and water spirit. Some legends depict the original Melusine as transforming only on Saturdays. A version of a Nixie/Melusine is the Starbucks logo that has two tails. Also, some legends depict Melusines sometimes transforming into dragons when they are discovered.