Nix is a male ferret Jewelpet with purple fur, a black-tipped tail, and orange jewel eyes. He is notably taller and thinner than most Jewelpets due to his long body, and he wears a light blue scarf fastened with a small orange star gem. He is one of the Jewel Eight, a group of special Jewelpets, and his symbolic domain is reconciliation.

His personality is generally cool and easy-going, and he is often seen taking naps. At his core, Nix is a gentle and peaceful individual who balks at the idea of fighting or causing harm. This natural disposition makes him all the more vulnerable when he falls under the influence of Dian’s dark magic in Jewelpet Sunshine. Debuting in episode 33, Nix is the first Jewelpet to be brainwashed by Dian, causing his normally positive magic to reverse. Under this corruption, he uses his powers to stir up petty arguments and major conflicts among humans, taking advantage of his natural ability to influence personal relations. His role in the story becomes one of a initial antagonist driven by external control, and the protagonists—Rinko and her group—must reclaim him through the Jewel Games. Once freed, Nix returns to his true self and is restored to the side of the Jewelpets.

His key relationships are defined by his membership in the Jewel Eight, though he interacts with other Jewelpets and human characters during the reclamation arc. His development centers on overcoming brainwashing and reaffirming his peaceful nature. In terms of abilities, Nix’s jewel magic is centered on reconciliation: under normal circumstances, his power can end quarrels and bring humans back together. This contrasts sharply with the chaos he causes while corrupted, highlighting the duality of his magic. Beyond Jewelpet Sunshine, he appears as a minor or background character in other seasons of the series, but his most prominent story role is in Sunshine as a brainwashed member of the Jewel Eight who must be saved.