Zenless Zone Zero Billy Build and Rotation Guide

To maximize Billy’s damage in Zenless Zone Zero, build him around Physical damage and Critical stats using a 4-piece Fanged Metal set, then maintain his high-multiplier crouching stance by initiating with slide attacks and canceling attack recovery with his EX Special.

Core Mechanics and Crouching Stance Execution

Billy acts as a stationary Physical damage dealer whose damage output scales dramatically while crouched. Entering the crouching stance boosts his basic attack damage multipliers, turning standard firing patterns into heavy rapid-fire bursts. Because he cannot move while crouched, staying in the stance without an exit plan leaves him exposed to incoming attacks.

To maintain damage uptime without taking hits, control your stance transitions:

1. Enter via Slide: Perform a directional dash or slide dodge, then immediately input a Basic Attack. This snaps Billy directly into his crouching stance without cycling through standard standing shots.
2. Reposition via Dash Attack: If an enemy prepares an unblockable attack, execute a directional dash attack to slide out of danger and reset your firing angle.
3. Cancel Recovery via EX Special: When an enemy recovers from daze or begins a swing, activate Billy's EX Special Attack. This cancels the end lag of his crouching volley and grants invulnerability frames (i-frames) while dealing daze damage.

Drive Disc Sets and Stat Priorities

Billy’s high rate of fire allows him to rapidly trigger the Assault anomaly, making sets that reward Physical status effects the most effective.

• 4-Piece Set: Fanged Metal provides a 35% damage buff against enemies afflicted with Assault, which Billy consistently triggers through high-volume shooting.
• 2-Piece Set: Woodpecker Electro grants additional Crit Rate to stabilize multi-hit damage. Alternatively, Puffer Electro provides PEN Ratio and Ultimate damage for burst-oriented rotations.

Aim for roughly 60% to 70% unbuffed Crit Rate before heavily investing in Crit DMG. Multi-hit physical attackers lose substantial average output if individual bullet hits fail to land critical strikes.

Recommended W-Engines

Billy benefits most from engines that enhance Basic Attacks, reward dodging, or increase base Attack and Critical stats.

• The Brimstone (S-Rank): Stacks an Attack buff when landing Basic Attacks, Dash Attacks, or Dodge Counters. Billy’s fire rate reaches maximum stacks almost instantly.
• Steel Cushion (S-Rank): Grants base Crit Rate and increases Physical damage, providing an additional multiplier when hitting enemies from behind.
• Starlight Engine (A-Rank): Grants an Attack increase for 12 seconds after triggering a Dodge Counter or Quick Assist, pairing smoothly with quickswap play.
• Street Superstar (A-Rank): Accumulates Charge whenever squad members trigger Chain Attacks, boosting Billy's Ultimate damage for burst setups.

Skill Leveling Priority

Level Billy's skills in order of their overall contribution to his rotation:

1. Basic Attack: Levels both standing shots and crouching fire multipliers; this is his primary source of damage.
2. Ultimate / Chain Attack: Delivers large-scale Physical burst for clearing crowds and punishing stunned bosses.
3. EX Special Attack: Provides necessary invulnerability frames and supplementary daze during stance cancels.
4. Dodge: Scales the damage of his slide attacks and Dodge Counters.
5. Assist Skills: Lowest priority; primarily offers quickswap defensive utility.

Team Compositions and Assist Synergy

Billy performs best when paired with a Stun agent to immobilize targets and a Support agent to group enemies or prevent stance interruption.

• Standard Core (Billy / Nicole / Anby): Nicole pulls scattered enemies together with her EX Special energy field and applies a DEF shred. This concentrates Billy's cone-shaped crouching fire on multiple grouped targets. Anby reliably builds the daze meter to trigger Chain Attacks.
• Shielded Hypercarry (Billy / Caesar King / Koleda): Caesar King grants an active Attack buff and an anti-interruption shield, preventing elite enemies from knocking Billy out of his crouching posture. Koleda handles rapid daze buildup.
• Assault Anomaly Focus (Billy / Piper / Support): Piper rapidly stacks the Assault anomaly to maintain permanent uptime on Billy's 4-piece Fanged Metal buff, though this comp requires tighter dodging discipline without a dedicated Stunner.

Equip your Support agent with a 4-piece Swing Jazz set to grant the entire squad a damage boost upon exiting Chain Attacks, allowing Billy to take the field with maximum active buffs.