Nickel holds the position of chief guard captain in the Zoble Imperial military. He displays a youthful appearance marked by blonde hair and narrow eyes, projecting a deceptive impression of innocence. Despite this boyish exterior, he possesses the highest documented combat capabilities among the demon forces, making him a significant physical threat. His primary offensive ability allows him to transform his arms into multiple prehensile tentacles, functioning as both weapons and tools to ensnare opponents during combat. Nickel's voice carries a distinctively high-pitched, childlike quality that generates discomfort even among fellow demons, adding to his unsettling presence.

Assigned as the initial assassin targeting the Idaten deities, Nickel confronts Hayato in direct combat and secures victory through superior prowess, demonstrating his formidable capabilities. This success proves short-lived when Rin, an original-generation Idaten, intervenes. Rin effortlessly dispatches Nickel, resulting in his immediate demise. Following defeat, Nickel's remains are transported to Ysley's research laboratory, becoming subjects for scientific examination and experimentation focused on demon physiology and capabilities. This posthumous analysis provides critical intelligence to the Idaten regarding demon vulnerabilities and biological composition.

His narrative function centers on demonstrating the threat level of the Zoble Empire's enhanced demons while simultaneously establishing Rin's unmatched combat superiority in their encounter.