Nova is introduced as the daughter of Lady Debonair and is an anime-only villainess. She has a very slender form with pink hair and elfin ears, and appears to be of a similar age to the three heroines. Throughout the series, Nova gives the impression of being an unstable character, often switching between expressing affection and issuing death threats in the space of a heartbeat.

Frequent hints about a hidden bond between Nova and Hikaru escalate until the truth is revealed in the culmination of the second season. Nova is really a shadow of Hikaru's heart. When Hikaru couldn't get over the fact that she killed Princess Emaurade, Nova was created in that instant. Since Hikaru, Umi, and Fuu left right after, Nova was left behind in Cephiro. She searched and searched but couldn't find Hikaru. Then Lady Debonair came and told her she would treat her as her own daughter. Debonair told her that Hikaru would be very happy if she could die with the people she loved, so she should kill them all. That is why Nova "hates" everyone Hikaru loves...and Hikaru hated herself for killing the Princess, therefore Nova loved Hikaru. Near the end of the series, Nova returns to Hikaru's heart.

She is named after the Chevrolet Nova.

Nova was created by Toshihiro Hirano. She was originally one of his characters from a different anime that was never realized and produced.