Starlight Billy Leak Reveals Dual-Mode Physical DPS Kit for Zenless Zone Zero

A comprehensive look at the upcoming S-Rank Agent, Starlight Billy, has surfaced from trusted sources within the Zenless Zone Zero community. As of 2026, the leaks detail a character of the Physical Element and Rupture Class, whose core gameplay revolves around a dynamic, high-risk, high-reward system of switching between two distinct combat modes. While this information is subject to change upon his official release, it paints a picture of a powerful, defense-ignoring damage dealer whose effectiveness scales with his own maximum health.

Starlight Billy's kit is defined by his ability to shift between Free Mode and Bike Mode. In his default Free Mode, Billy utilizes a series of basic martial arts and acrobatic attacks. His four-hit basic attack combo not only deals Physical Damage but also restores his health. A well-timed input during the fourth attack allows him to perform a 'Basic Attack: Moto Dash', launching him onto his signature bike and transitioning into the aggressive Bike Mode.

Once mounted, his gameplay transforms dramatically. Bike Mode is a state of heightened offensive power but comes with a constant health drain. To compensate, Billy gains a massive 100% increase in CRIT DMG, a 40% damage reduction, and enhanced resistance to interruptions. Every attack he makes while riding generates [Heat], a resource that fuels his most devastating ability.

His skill set in this mode includes blazing through enemies with wheelies and tail-whip attacks that build Heat. The management of this resource and his depleting health pool becomes the central challenge and reward of his playstyle.

Core Mechanics and Passive Abilities

Billy's damage output is uniquely tied to his survivability through his Core Passive. He gains Sheer Force based on his Max HP, with every point of HP contributing 12 points of Sheer Force. Crucially, all Physical Damage he deals is converted to Sheer DMG, which ignores enemy defense and uses his Sheer Force stat as the damage multiplier. This makes building HP on Billy directly impactful on his damage potential.

His passive also includes several key survival tools:

• Adrenaline Recovery: He starts battles with 120 Adrenaline.

• Last Stand Shield: Upon taking fatal damage, he negates it and gains a shield worth 10% of his Max HP.

• Mode-Specific Triggers: Skills like 'Moto Dash' and 'Tail Whip' grant stacking shields, while certain actions in Free Mode restore health, enabling a safe return to Bike Mode.

Powerful Abilities and Ultimate

Billy's arsenal is filled with flashy, high-impact moves. His Special Attack serves as his mode-swap button, with a press in Free Mode mounting the bike and a press in Bike Mode dismounting. Both versions have a Perfect Dodge window that, when triggered, restores a significant portion of his health.

The pinnacle of his kit is the Enhanced EX Special Attack, unlocked when his Heat gauge is full in Bike Mode. This move, the 'EX Special Attack: Starlight Knight Flying Kick', sees Billy leaping off his bike to deliver a massive, defense-ignoring Physical DMG kick. The skill grants invincibility during its animation, consumes all Heat, restores 20% of his Max HP, and returns him to Free Mode, completing a full combat cycle.

His Ultimate ability is a spectacular display: he enters Bike Mode, charges forward in a devastating rush, and finishes by firing a powerful laser beam, all while being invulnerable.

Team Synergy and Constellations

Early analysis suggests Billy will benefit from teammates who can bolster his durability or provide buffs, allowing him to maintain his high-risk Bike Mode longer. His Additional Ability provides a damage buff when paired with characters from the Stun, Defense, or Support specialties, enhancing his core damaging skills.

While details for most of his Constellations (C1, C2, C4) remain under wraps, a leak for his C6 effect has been revealed. At this maximum investment, Billy gains a 20% increase in CRIT Rate. Furthermore, launching a Basic Attack boosts his Physical Sheer DMG by 12%, stacking up to two times. This constellation solidifies his role as a premier critical hit-focused, health-scaling damage dealer.

Initial Impressions and Potential

From the leaked information, Starlight Billy appears to be a straightforward yet highly effective Physical DPS character. His skill ceiling lies in expertly managing his HP resource, toggling between modes for survival and damage, and building Heat for his explosive finishing move. His defense-ignoring Sheer DMG mechanic makes him particularly potent against high-defense bosses and enemies.

This design philosophy suggests he could become a meta-defining character for specific challenging content where health-based scaling and sustained, unblockable damage are paramount. Players looking for a dynamic, high-damage agent with a unique risk-management playstyle will likely find Starlight Billy an exciting addition to their squad upon his anticipated release in 2026.