Personality: Honest and stoic. Formerly described by his superiors in the organization as a "man of integrity and stoicism." Cold and mysterious: He currently claims that his "former self no longer exists" and calls himself an "operative wandering through dreams." He is an elusive character with a cold-heartedness that doesn't shy away from unnecessary combat to achieve his goals, possessing villainous traits. Hairstyle: Clean, black, neat short hair. Gives a cool and intellectual impression. Clothing: Reflecting his background as a detective and agent, he wears chic suits and mature, black-based outfits. When transformed into Kamen Rider Nox, he takes on a stylish, dark-colored form suitable for his ability to manipulate darkness and shadows. Kamen Rider Nox (Standard Form): Transforms by loading a Shadow Capsem into the Nox Driver. It is an asymmetrical dark hero design with glossy metallic blue on the left half and vivid metallic orange details on the right half and throughout the body. He has the ability to hide in or manipulate shadows. Midnight Shadow (Ultimate Form): A more powerful and divine form achieved by overcoming the deep darkness within his own subconscious, balancing the powers of darkness and light. Mostly silent. Speaks in riddles and circumlocutions.

Real Name: Soma Kumon. Position: A young elite serving as the Chairman of the National Public Safety Commission. He is actually a relative (cousin) of Nox (Kensei Kotaka). Goal: Revenge against the agent organization (modern-day CODE) that purged his ancestors during the Edo period, and protecting the country through his own brand of justice. Hairstyle: A refined, well-groomed center part befitting his status as a young political elite. He is characterized by a chilling, cold gaze peeking through his bangs. In the story and character visuals, he wears beautifully fitted jackets smartly, exuding the overwhelming charisma and elegance of an elite. Compared to Nox's monotone and shadowy clothing, his attire is neat like a politician standing on the public stage, yet it possesses a cold beauty that seems to camouflage his hidden, suspicious ambitions. He is not merely absolute evil, but the "most terrifying dark hero" with his own strong convictions. Overwhelming charisma and coldness: A ruthless strategist who chooses any means to achieve his goals, such as skillfully inciting the public and spreading misinformation to frame the protagonists, Baku Yorozu and others, as villains. Distorted patriotism and justice: He has a side that "loves his beautiful mother tongue" and blindly believes in the Kumon family mission to protect the country from all evil. As his actor Sono mentioned, he possesses a sense of justice so pure it has spiraled into madness, believing he is leading people in a better direction. Transformed Form and Abilities (Kamen Rider Mugen): Transforms using the "Mugen Driver," a modified version of the Nox Driver technology he obtained through unknown means, and the "Daydream Capsem." Ability (Power of Daydreams): Manipulates the terrifying power to rewrite reality into a "world of daydreams" that combines the conflicting natures of "dreams" and "reality." Combat Style: His greatest highlight is his overwhelmingly refined swordsmanship using his specialty, the "katana." With a fighting style that absorbs or nullifies enemy abilities while cutting them down in a single stroke, he boasted enough combat power to utterly crush Zets and Nox.