Nobimaru, a kitsune capable of altering his appearance, frequently masquerades as a youthful boy with short blond hair, golden eyes, and a beauty mark beneath his left lip. His fox ears remain hidden under black-and-yellow headphones, paired with formal attire that contrasts his true form—a taller, mature figure clad in a cropped leopard-print coat and sunglasses. Sustaining this disguise drains energy, impairing his healing and occasionally exposing residual kitsune traits.

Outwardly polite and cooperative, Nobimaru masks a cunning, manipulative nature. He finds exhilaration in violence and strategically exploits others for personal gain. Though he feigns loyalty to Yoko Inari, his superior, he secretly resents her oppressive methods, often disobeying orders to protect allies like Kon or sabotage Inari’s plans. His motives remain shrouded in moral ambiguity, balancing self-interest with unpredictable alliances.

His abilities encompass superhuman strength, heightened reflexes, and pyrokinesis, notably his "Flower Kindling" technique—flame seeds detonated by a finger snap. He crafts illusions to erase memories, multiplies his form to disorient foes, and shifts into diverse human guises.

Nobimaru’s alliance with Inari serves undisclosed ambitions, yet his disdain for her tactics drives covert defiance. He manipulates subordinates through blackmail, as seen with Umetaro Matsutake, and seeks to exploit Kabane Kusaka’s loyalty and regenerative prowess. Despite his solitary tendencies, he intermittently aids Kabane’s group, subtly undermining Inari while avoiding outright rebellion.

His actions weave between antagonism and reluctant cooperation: leaking Inari’s schemes, shielding Kon from elimination, and prioritizing self-preservation over obedience. These choices risk his standing, threatening to brand him a traitor. Gradually, his solitary scheming evolves into indirect collaboration, hinting at strategic pragmatism interlaced with unspoken empathy.