Nahusha appears in the anime film Zegapain STA as a high-ranking figure within the Gards-orm, serving as one of their technical officers. His background places him among the Alters, a race of beings capable of manipulating reality itself, which sets him apart from ordinary humans and Cerebrants alike. Nahusha is characterized by a highly analytical and intellectual mindset. He relies heavily on logic and reason, often approaching situations with emotional detachment that can make him seem cold or distant to others. Despite this outward composure, he harbors deep internal turmoil, particularly connected to a plan to resurrect a lost love, a motivation that drives much of his actions throughout the story.

Nahusha functions as one of the primary antagonists in Zegapain STA, presenting a formidable challenge to the Cerebrum forces and the protagonist Kyo Sogoru. His role is defined by his calculated strategies and his willingness to go to any lengths to achieve his objectives. In terms of abilities, Nahusha possesses a powerful Alter skill that allows him to control gravity, generating devastating shockwaves capable of destroying entire cities. He is also noted as a brilliant strategist, adept at exploiting the weaknesses of his opponents in battle. His personality is marked by a fragmented and unstable quality early on, which later reveals itself as part of a larger, deeply personal scheme. Key relationships include his ties to other Gards-orm operatives and the protagonists he opposes, though his primary emotional anchor remains the lost individual he seeks to revive. Through the narrative, Nahusha's character undergoes development that exposes the tragic underpinnings of his actions, adding complexity to his role as an antagonist.