Regalia was not shown to be a living entity such as Rayearth, Selece, and Windam. Nova was bestowed a Rune God by the name of Regalia. She then invaded Hikaru's mind in an attempt to capture her while Hikaru was re-attaining her sword with assistance from Sierra. She was the one responsible for breaking Hikaru's sword. Throughout the second season, Nova creates many diabolical schemes to capture Hikaru.
She peacefully claimed to be, "The one made just for you, Hikaru." She then immediately revealed her desire to kill Hikaru. She then later appeared to Hikaru in the Magic Knights' first confrontation of Debonair. Nova first appeared as a shadowy image in one of Hikaru's dreams in which Debonair was beginning her invasion of Cephiro. Believing her adoptive mother, Nova went and began her conquest to eliminate her creator. Debonair convinced her that if she really loved Hikaru, Nova would kill her and all of her loved ones so that they could always be together. She was found and adopted as a daughter by Lady Debonair. Due to Emeraude's transporting the Knights back to Tokyo immediately after, Nova was left alone to wander Cephiro, hopelessly searching for Hikaru. Nova was born out of the darkness in Hikaru's heart, after she had killed Princess Emeraude along with the other Magic Knights. Although mischievous in some ways, Nova is empathic of Hikaru, since she can feel every emotion she is feeling. Her determination stems from Debonair telling her that if she loved Hikaru, she would kill her and all her loved ones, prompting her homicidal tendencies. Her feelings for Hikaru are child-like, often wanting Hikaru to be only hers, proven by her immediate dislike of other characters that Hikaru cares for. For example, whereas Hikaru is kind-hearted and willing to help those in need, Nova is selfish and pretty sadistic, as she referred to screams of pain as "cute" at one point. Nova is somewhat like Hikaru, determined and childish, but as a dark counterpart to her, she has personality traits that completely contradict Hikaru's as well.