Nami Shiina, also known as Iczelion Black, originates from the DNA of Iczel Prime. This grants her exceptional physical strength, speed, and intellect. She maintains a dual life as a rock singer and rave dancer in a nightclub alongside her role as a warrior. Among the Iczelions, she possesses the most direct and self-assured demeanor, consistently appearing confident and decisive.

Her combat capabilities focus on gravity manipulation, making her signature attacks among the team's most powerful. She masters dual beam swords with unmatched skill and excels in hand-to-hand combat, outperforming her peers. Her defensive barrier stands as the strongest of the four Iczelions, providing exceptional protection. A key technique channels her suit's full power into her beam sword to unleash the "Gravity Slash," drastically amplifying its destructive force. Additional named attacks include "Gravity Barrier Ram," "Gravity Well," and "Implode Gravity Vortex," all leveraging gravity-based mechanics.

Initially, Nami maintains emotional distance and struggles to connect with the other Iczelions, occasionally seeming cold or aloof. This stems partly from her independent nature and focus on tactical efficiency, leading her to reprimand teammates for perceived mission mistakes. Despite this, she demonstrates fierce loyalty, particularly when allies are threatened, declaring: "I won’t forgive anyone who dares to hurt my friends!"

Her character development involves gradual integration into the team dynamic. Beginning as a solitary figure reliant on her own capabilities, she ultimately proves her value through coordinated efforts against the invading forces of Chaos and Cross. This evolution highlights her acceptance of collective strength without compromising her assertive identity. Her journey reflects themes of self-acceptance and the necessity of collaboration against external threats.