OVA
Description
Iczer-2 is a gynoid bioroid weapon crafted by the alien Big Gold to specifically counter and kill Iczer-1, whom she addresses as "big sister." She pilots the mecha Iczer Sigma, commanding floating mines and channeling atmospheric energy discharges in combat. Her standard armament includes generating energy swords at will, while her physical strength and destructive capacity operate at multi-solar system levels, supplemented by massively faster-than-light travel. Unlike Iczer-1, she lacks time-travel abilities.

Originally defined by thorough evil, Iczer-2 embodies egoism, arrogance, cruelty, and zero empathy. Her sole objective was eliminating Iczer-1, leading to a battle where Iczer-1 killed her to avenge partner Nagisa Kanō's death. Five years later, during the Second Gold War, antagonist Neos Gold resurrected Iczer-2 after the failure of clone Atros, reasoning only an Iczer-class entity could defeat another Iczer. Revived, Iczer-2 refused Neos Gold's control, reiterating her exclusive drive to destroy Iczer-1. Neos Gold manipulated her by claiming killing Iczer-3—Iczer-1's younger sister—would force Iczer-1 to return for vengeance.

Confronting Iczer-3, Iczer-2 effortlessly overpowered the inexperienced gynoid, treating combat as play while asserting fighting is the inherent purpose of all Iczers—a philosophy Iczer-3 rejected. When Iczer-1 returned to aid Iczer-3, Iczer-2 seized a rematch. Fighting at full strength, she lost again to Iczer-1, who spared her life, vowing not to let another sister die in battle. This act shifted Iczer-2's allegiance, uniting her with Iczer-1 and Iczer-3 against Neos Gold. During the alliance, she bisected Neos Gold's minion Golem after being dismissed.

Post Neos Gold's defeat, Iczer-2 left Earth to wander the universe, suggesting they might reunite. Five years later, she fully rejoined the C'thuwulf as military commander, bonding with Earth girl Sayoko Kai, her devoted partner. Alternate media like the "Iczer Girl Iczelion" radio drama novelization altered her design: replacing elf-like ears with mechanical antennae and omitting her mecha-summoning ability. She was renamed "Sigma" from her mecha's designation in these adaptations.