Nova

Agent Nova (ノヴァ) is the main antagonist of the Nova Arc, the hidden secondary antagonist of the Veltrax Arc, and the eleventh and final antagonist in Silver Days. This is the original depiction of Nova.

She was an elite warrior from the rare Numerion race and one of the most powerful members of the now defunct Future Corps. As Delta's partner in combat, Nova betrayed the Future Corps and traveled to the past, aiding Team Silver against Veltrax.

However, upon the discovery that she and Delta were the ones responsible for unleashing the monster, Nova disposed of Veltrax and allowed her rogue team, the Legion, to travel to the past. Nova used the Legion to lead a rampage across Earth in order to kill Silver and rule the galaxy.

Unfortunately for her, Delta defected to Team Silver at the last minute and allowed Silver and Nexus to gather Sama's divine energy, forming it into a God Bomb and using it to finally end Nova's reign of terror.

Trivia

 * Nova's race was responsible for the creation of the GENEX. In particular, one of her ancestors volunteered to destroy the artifact but was killed.