TV-Series
Description
Zero Kirisame began as a distinct avatar created and controlled by Akira Oono within the MMORPG Infinity Game, serving as his primary character for a decade. After Akira's transportation into a new world within the game's framework, he gained the ability to temporarily assume Zero's form. During these transformations, Akira retains his own memories but exercises minimal control over Zero's actions and behavior, often switching to this persona to address threats while maintaining Hakuto Kunai's separation from those events.

This form manifests as a man approximately 180 cm tall, with silver-dyed hair and mint green eyes. He wears distinctive white battle clothes adorned with ostentatious, ominous inscriptions declaring phrases like "Peerless Under the Heavens," "First Class Fighter," and "World’s Strongest." A prominent silver dragon motif features on the back of his garments. Zero's personality contrasts sharply with Akira's usual demeanor, exhibiting extreme pride, arrogance, and a propensity to boast about his unparalleled strength. He harbors intense wrath, specifically directed toward the Grand Empire under Hakuto Kunai's control, declaring himself its enemy. In combat, he displays berserker-like tendencies, reveling in challenging fights. Despite his bravado, he possesses a strong sense of justice, particularly regarding the protection of women and children from abuse by stronger entities. He also exhibits discomfort with direct physical contact with women.

Within the new world, this persona first emerged when Hakuto Kunai transformed to rescue Killer Queen and Luna Elegant from Satanists. The transformation occurred again later to defeat Oluit and save Tron. Zero's combat style revolves around powerful melee engagements, capable of overwhelming superior demons with relative ease. His capabilities are defined by specific parameters and skills: Level 1 status with high Health (165) and Vitality (300), augmented Attack (+85), Defense (+75), Speed (+80), and Magic Defense (+55), though Magic Power remains at zero. Key abilities include Kenpou, Close Combat, and Final Phoenix as Attribute Skills, alongside Battle Skills like Grudge, Storm Blow, and Righteous Hero.

His most significant skill is the Decisive Battle Skill "All-or-Nothing / Do or Die," which inflicts 10 additional damage per kill previously committed by his opponent, capped at 500 damage—making it exceptionally lethal against foes with extensive kill counts. Additionally, the Special Ability "Mad Flurry" triggers explosive stat increases when facing a 'team' marked with a Grudge, though these boosts are inactive otherwise. Grudge targets can be switched up to three times daily.

Zero utilizes no conventional weapons, relying solely on barehanded combat with infinite durability. His armor, the Silver Dragon Battle Clothes, also possesses infinite durability but offers negligible defensive capability despite its rarity and special abilities within the original game. He possesses a motorcycle, designated 750RS (Z2), which significantly reduces vitality consumption during travel, enabling rapid long-distance movement far surpassing conventional carriages.

Akira expresses embarrassment regarding Zero's flamboyant and confrontational nature, though similarities in their behavior are occasionally noted. The persona declares himself—"I'm Zero. Zero Kirisame."—incorporating a deliberate homage to Ultraman Zero's iconic pre-battle catchphrase. Conceptually, Akira likens the contrast between his personas by stating, "If Kunai is your family home, then Zero is your studio apartment," highlighting Zero's role as a separate, more transient identity.