Emeraldas appears in "Cosmo Warrior Zero Gaiden" as a secondary character. She commands the spaceship Queen Emeraldas, marked by its skull emblem. A facial scar, its origin unspecified within this narrative, is part of her background. She operates autonomously, adhering to a personal code of honor. Emeraldas shares a connection with Captain Harlock and Tochiro, sometimes appearing during critical confrontations involving Warrius Zero. Her interactions typically focus on strategic choices in conflicts, especially those threatening the skull insignia she protects as a symbol of resistance. She wields a Cosmo Dragoon pistol and demonstrates significant combat proficiency. Her character design features long blonde hair, a cape, and a distinct uniform. No unique character development or additional backstory specific to "Cosmo Warrior Zero Gaiden" is provided within this narrative.