Alexandrina Sebastine, commonly known as Rina, serves as a cornerstone for Electric and Support-driven archetypes in Zenless Zone Zero (ZZZ). As an S-Rank Electric Support character from the Victoria Housekeeping Co., her value does not stem from raw damage output but from a unique scaling mechanism tied to the PEN Ratio. In high-level endgame content like Shiyu Defense, where enemy defenses significantly mitigate incoming damage, Rina’s ability to bypass these resistances becomes a non-negotiable asset for any competitive roster.

Core Mechanics and the Importance of PEN Ratio

To understand the best build for Rina, one must first master her Core Passive: Mini Destruction Partner. Unlike typical supports who provide flat Attack (ATK) buffs, Rina shares a percentage of her own PEN Ratio with her squad members.

When Rina commands her puppets, Drusilla and Anastella, to attack, the active character on the field gains a PEN Ratio bonus equal to 25% of Rina’s current PEN Ratio, plus a base flat percentage (starting at 6% and increasing with skill levels). This buff is capped at a maximum of 30%. Because the buff only lasts while the puppets are on the field, Rina’s gameplay revolves around maximizing her PEN Ratio stat while ensuring high puppet uptime through specific combat rotations.

In our testing, the difference between a Rina with baseline PEN and one optimized with high-tier gear resulted in a total team damage increase of approximately 18-22% against boss-level enemies. This makes PEN Ratio the single most important stat to prioritize across all gear pieces.

Best W-Engines for Rina

Choosing the right W-Engine for Rina is about balancing her primary stat needs with utility for the rest of the team.

S-Rank Choice: Weeping Cradle

The Weeping Cradle is Rina’s signature W-Engine and is undisputed in its efficiency. It provides a massive base PEN Ratio boost, which directly feeds into her Core Passive. Furthermore, its effect increases the squad’s damage against targets hit by the equipper. While Rina is off-field, it grants additional Energy Regeneration, ensuring she can frequently use her EX Special Attack to redeploy puppets and maintain the PEN buff.

A-Rank Alternatives: Efficiency and Utility

For players without access to her signature weapon, several A-Rank options provide competitive results:

  • Slice of Time: This is often considered the best F2P-friendly or low-investment option. It provides a secondary stat of PEN Ratio, which is essential. Additionally, it generates extra Decibels and Energy for the team upon using EX Special Attacks or Chain Attacks, allowing for faster Ultimate rotations.
  • Kaboom the Cannon: A solid choice for general team utility. While it focuses more on Energy Regeneration and providing a team-wide ATK buff, it lacks the raw PEN scaling that Rina desires. Use this if your team is already hitting the PEN cap or if you lack PEN-focused engines.
  • Unfettered Game Ball: This engine focuses on increasing the squad’s Crit Rate when the equipper triggers an Attribute Counter. Given Rina’s frequent Electric application, this can be highly effective in Mono-Electric teams where she consistently counters enemies.

Best Drive Disc Sets for Peak Performance

Drive Discs are the most flexible part of a Rina build, but for optimal performance, a specific combination of sets is required to maximize both her personal stats and team support.

The Standard Meta Build: 4-piece Swing Jazz + 2-piece Puffer Electro

This is the most balanced and effective setup for Rina in almost all scenarios.

  • 4-piece Swing Jazz: This set increases Energy Regeneration by 20% and provides a 15% damage boost to the entire squad for 12 seconds after Rina performs a Chain Attack or Ultimate. Since Rina is often swapped in specifically for these actions, the uptime on this buff is exceptionally high.
  • 2-piece Puffer Electro: This is a crucial addition, as the 2-piece bonus provides an 8% increase to PEN Ratio. This directly scales her Core Passive, making it superior to 2-piece sets that provide ATK or Electric DMG for a support-oriented Rina.

The Anomaly Specialist Build: 4-piece Freedom Blues

In teams focused on Anomaly buildup (such as those featuring Grace or Yanagi), the Freedom Blues set can be an alternative. It reduces the enemy’s Anomaly Buildup RES to the equipper’s attribute. However, in most traditional DPS setups, the raw PEN Ratio sharing provided by the Swing Jazz/Puffer Electro combo remains the higher-value option.

Optimal Main Stats and Sub-stats Priority

To reach the 30% PEN sharing cap, players must be meticulous with their Drive Disc main stats.

Main Stat Recommendations

  • Partition 4 (Disk 4): Anomaly Proficiency or ATK%. While Rina is a support, her puppets do contribute to Electric Anomaly buildup (Shock). Anomaly Proficiency is generally preferred in teams relying on Disorder reactions.
  • Partition 5 (Disk 5): PEN Ratio %. This is mandatory. Without a PEN Ratio main stat on Disk 5, it is nearly impossible to reach the higher thresholds of her Core Passive buff.
  • Partition 6 (Disk 6): Energy Regen %. Rina must have her EX Special Attack available as often as possible. Energy Regen ensures she can keep her puppets active and trigger Quick Assists frequently.

Sub-stat Priority

When farming for Drive Discs, prioritize sub-stats in the following order:

  1. PEN Ratio (Flat): To further push the Core Passive.
  2. ATK%: To provide a slight boost to her own damage contribution.
  3. Anomaly Proficiency: To enhance Shock damage and buildup.
  4. Flat ATK / Crit Stats: These are secondary and should only be focused on after meeting PEN and Energy requirements.

Skill Upgrade Priority and Resource Management

Resources in Zenless Zone Zero are limited, so focusing on the correct skills is essential for a high-value build.

  1. Core Skill: This is the highest priority. Upgrading the Core Skill directly increases the percentage of PEN Ratio shared with the team.
  2. Special Attack / EX Special Attack: This is her primary method for deploying puppets and triggering Quick Assists. It also has a significant invulnerability window (i-frames), making it vital for safe rotations.
  3. Chain Attack: High priority for the damage boost provided by the Swing Jazz set and for its significant Electric DMG.
  4. Basic Attack & Dodge: Lowest priority. Rina spends very little time on-field performing basic attacks.

Best Team Compositions for Rina

Rina shines brightest when her "Additional Ability" is activated, which requires another Electric character or another member of the Victoria Housekeeping Co. in the squad.

The Mono-Electric Powerhouse (Grace + Anton + Rina)

This is the classic Electric team. Grace applies Shock rapidly, Anton serves as the Burst DPS during the Shock windows, and Rina provides the PEN Ratio buffs that allow Anton's drills to shred through enemy defenses. The Additional Ability here increases the duration of Shock and boosts the team’s Electric DMG.

The Victoria Housekeeping Synergy (Ellen + Lycaon + Rina)

While Ellen Joe is an Ice DPS, Rina can still serve as a potent support in this team. By pairing with Lycaon (also Victoria Housekeeping), Rina activates her Additional Ability. In this setup, Rina provides PEN Ratio support which is universal, helping Ellen bypass Ice resistances while also offering occasional Shock applications for chip damage and crowd control.

The Disorder Team (Jane Doe + Grace + Rina)

In a Disorder-focused team, Rina’s role is to enhance the Shock damage that contributes to the Disorder proc. Her PEN Ratio buff applies to the massive damage spikes seen during Anomaly reactions, making it a viable alternative to dedicated Anomaly supports in certain high-armor matchups.

Mindscape Cinema Analysis: Key Investments

For players looking to invest further in Rina, understanding her Mindscape Cinema (MC) levels is crucial.

  • MC1 (Dance Duet): This is her most transformative upgrade. It increases the duration the puppets stay on the field by 5.5 seconds and enhances the PEN Ratio buff effect to 130%. This makes her rotations significantly more lenient and increases the buff's raw power.
  • MC2 (Master’s Paragon): Provides a personal damage boost for Rina upon entering the field. While decent, it doesn't change her support utility significantly.
  • MC6 (Stormy Night’s Fright): A massive boost for endgame players. When her EX Special, Chain Attack, or Ultimate hits, the entire squad gains an additional 15% Electric DMG buff. This cements her as the ultimate support for Electric teams.

Advanced Combat Tips and Rotations

To get the most out of a Rina build, you cannot simply "button mash." You must understand her puppet mechanics.

  • The Quick-Swap Loop: Rina is designed for high-frequency swapping. The ideal rotation involves using an EX Special Attack to send both puppets out, then immediately using a Quick Assist (triggered by her EX) to bring in your main DPS.
  • Puppet Tracking: Observe the UI or the physical location of Drusilla and Anastella. If they are hovering near Rina, the buff is inactive. If they are near the enemy, the buff is active.
  • Using the Ultimate: Rina’s Ultimate is excellent for clearing waves and applying massive Shock buildup. However, in boss fights, it is often better to save the Decibels for your primary DPS unless you need the Energy Regen provided by the Swing Jazz 4-piece set bonus immediately.

FAQ: Common Questions About Rina's Build

What is the PEN Ratio cap for Rina?

Rina's Core Passive shares a portion of her PEN Ratio, but the total bonus received by a teammate is capped at 30%. Reaching this cap requires a combination of her signature W-Engine, a PEN Ratio Disk 5, and high-level Core Skill enhancements.

Is Rina better than Soukaku or Lucy?

It depends on your team. Soukaku is the premier Ice support, and Lucy is excellent for flat ATK buffs in Fire or Physical teams. Rina is uniquely specialized for Electric teams and scenarios where enemies have extremely high defense ratings, as PEN Ratio scales better than ATK buffs in late-game scaling.

Should I build Rina for Crit DMG?

Generally, no. While Rina can deal respectable damage, her primary value is her support buff. Investing in Crit usually comes at the cost of Energy Regen or PEN Ratio, which lowers the overall damage of your main DPS (like Ellen or Anton).

Summary of the Best Rina Build

To maximize Rina's potential in Zenless Zone Zero, focus on the following:

  • Stat Focus: PEN Ratio > Energy Regeneration > Anomaly Proficiency.
  • W-Engine: Weeping Cradle (S) or Slice of Time (A).
  • Drive Discs: 4pc Swing Jazz and 2pc Puffer Electro.
  • Main Stats: PEN Ratio % (Disk 5) and Energy Regen % (Disk 6).
  • Team Role: Quick-swap support who enhances team-wide penetration and Electric status effects.

By prioritizing these elements, Rina becomes more than just a support; she becomes a force multiplier that allows your primary damage dealers to ignore enemy defenses and clear the most challenging content with ease.