Naida Baron, daughter of Planet Fleed's aristocratic Baron family with deep historical ties to the royal lineage, grew up alongside Duke Fleed and her younger brother Syrius, forming a close childhood bond. She developed romantic feelings for Duke but suppressed them upon recognizing his mutual love with Princess Rubina, prioritizing their friendship and his happiness.

Her appearance features long green hair, purple eyes, and a light blue one-shoulder dress secured by a deep blue sash with a central green gem. She wears ribbon-like wrist ornaments and knee-high blue boots adorned with red diamond patterns.

The destruction of Planet Fleed and Princess Rubina's apparent death drastically altered Naida's path. Her brother Syrius perished protecting her during Grendizer's rampage, an event she wrongly blamed on Duke. This trauma fueled her quest for vengeance. To access Duke, she volunteered as the maid of Cassado, a high-ranking Vegan officer, enduring sustained mistreatment and psychological manipulation.

Vegan forces intensified her hatred through long-range brainwashing, compelling repeated assassination attempts on Duke. Yet her inherent compassion and residual affection caused significant internal conflict, undermining her resolve. During a critical confrontation, she stabbed Duke but could not deliver a fatal blow upon witnessing his enduring kindness. This shattered her brainwashed convictions, revealing Duke's innocence in Fleed's devastation and Syrius's death.

In her final act, Naida intercepted an approaching Vegan fleet using a bomb intended for the Photon Power Laboratory. She sacrificed herself by detonating the explosive, destroying the enemy forces and saving Duke. Before her death, she informed Duke of Princess Rubina's survival, providing crucial hope.