📋 Character Overview
Alexandrina Sebastiane (better known as Rina) is an S-rank Ether Support character in Zenless Zone Zero and the head maid of Victoria Housekeeping Co. She is widely considered one of the most valuable Support characters in the game due to her unique PEN Ratio buff — a rare and powerful stat that ignores a percentage of enemy DEF, effectively amplifying ALL damage dealt by her team. Unlike ATK% or DMG% buffs which have diminishing returns at higher investment, PEN Ratio remains valuable regardless of your DPS's existing stats.
Rina's core gameplay revolves around her two autonomous Bangboo helpers. When she uses her Special Attack or EX Special Attack, she summons these floating companions that orbit around her position and automatically attack nearby enemies. More importantly, any ally standing within the Bangboos' aura receives a substantial PEN Ratio buff that ignores a percentage of the enemy's Defense stat. This buff persists for 10 seconds even after leaving the aura, giving the team a generous window to reposition and deal damage.
Strengths: Provides the only team-wide PEN Ratio buff in the game (as of v1.4); truly universal — works with ANY damage dealer regardless of element or damage type (physical, ice, fire, electric, ether); excellent Energy generation through her Bangboo's auto-attacks; Chain Attack applies Ether damage and triggers additional Bangboo support; her Ultimate provides a massive team-wide PEN Ratio boost for burst windows. Weaknesses: Low personal damage — she is a pure support with negligible offensive contribution; requires manual positioning to keep the team within the Bangboo aura; the PEN Ratio buff has a limited radius, so ranged DPS characters may struggle to maintain uptime; no healing or shielding capabilities — she provides offensive utility only, leaving survivability to player skill or a third defensive unit.
Base Stats (Lv. 60)
🔍 PEN Ratio Mechanics Explained
Understanding PEN Ratio is crucial to appreciating Rina's value. In Zenless Zone Zero, every enemy has a Defense stat that reduces all incoming damage by a flat percentage. The formula works as follows:
Effective Damage = (Attacker ATK × Skill Multiplier × DMG% Bonuses) × (1 - Defense Reduction)
Where Defense Reduction = Enemy DEF / (Enemy DEF + Attacker Level + 800) × (1 - PEN Ratio)
Against a level 70 boss with approximately 850 DEF, a level 60 character faces roughly 52% damage reduction from Defense alone. Rina's PEN Ratio buff effectively bypasses a portion of this Defense. At 30% PEN Ratio (achievable with Core Passive level F + PEN Ratio substats), the Defense reduction drops from 52% to approximately 36% — a damage increase of roughly 33% for the entire team. This is multiplicative with every other damage buff, making PEN Ratio one of the most valuable offensive stats in the game.
Rina's Bangboo helpers provide this buff in an aura roughly 6 meters in radius centered on her current position. The buff persists for 10 seconds after an ally exits the aura. This means the ideal play pattern is: Rina uses EX Special to deploy Bangboos → DPS units move into the aura to receive the PEN Ratio buff → DPS units have 10 seconds to deal damage before needing to refresh. Her Ultimate replaces the basic Bangboos with an enhanced version that provides +50% more PEN Ratio for 15 seconds, making it an incredibly powerful damage multiplier for burst windows.
💡 The value of PEN Ratio increases as enemies get tougher. In endgame content like Shiyu Defense Floor 15 and high-level Hollow Zero, enemies have 900-1100 DEF. Against these opponents, Rina's PEN Ratio buff can increase team damage by 35-45% depending on her PEN Ratio investment. This makes her comparatively stronger in endgame content than in story mode.
🔧 Best W-Engine (Weapon)
| Priority | W-Engine | Rarity | Details |
|---|---|---|---|
| 🥇 Best | Weeping Cradle | S | Rina's signature W-Engine. Provides a significant PEN Ratio% primary stat and its passive generates Energy for the entire team whenever Rina's Bangboos hit an enemy. At refinement 1, every Bangboo attack restores 0.8 Energy to the active character, which translates to roughly 3-4 extra Energy per EX Special cycle. This enables Rina to maintain near-100% Bangboo uptime without ever using her own Basic Attacks. The PEN Ratio% main stat is the real prize — it directly increases the potency of her signature buff. |
| 🥈 Alternative | The Vault | A | Standard banner A-rank Support W-Engine. Provides Energy Regen% and grants ATK% to the whole team after the wielder uses a Chain Attack or Ultimate. Rina's Chain Attacks are easy to trigger since she's often the one initiating the rotation. At R5, the team ATK buff is 20% for 12 seconds — a very respectable universal buff. This is the best F2P option and performs at roughly 85% of Weeping Cradle's overall team contribution. |
| 🥉 Alternative | Slice of Time | A | Battle Pass support W-Engine. Provides Energy Regen% and increases the team's DMG% against enemies below 50% HP. Decent but less universal than The Vault — the conditional DMG% only kicks in during the second half of fights. About 5% worse than The Vault at equivalent refinement. |
| 🔄 F2P Starter | Bashful Demon / Bun Bun Blade | A | Both are craftable A-rank engines. Bun Bun Blade provides ATK% which slightly improves Rina's personal damage (but she doesn't do much anyway). Bashful Demon provides Energy on dodge. These are stopgap options — aim to replace them with The Vault from the standard banner as soon as possible. |
💿 Drive Disc Recommendations
Standard Support Build: Swing Jazz (4-Piece) + Freedom Blues (2-Piece)
Swing Jazz 4-Piece: Increases Energy Regen by 20%, and after using Ultimate, increases the team's damage by 15% for 12 seconds. Rina's Ultimate provides the enhanced Bangboo with 50% more PEN Ratio, and the Swing Jazz damage bonus stacks additively on top. This gives Rina the rare and powerful combination of ultility + team damage amp in a single set.
Freedom Blues 2-Piece: Increases Anomaly Proficiency by 30. While Rina is not primarily an Anomaly character, the extra Anomaly Proficiency helps her Bangboos apply Ether anomaly faster — which matters less for pure damage teams but becomes important in Disorder compositions where Ether anomaly can trigger additional reactions.
Alternate Build: Freedom Blues (4-Piece) + Swing Jazz (2-Piece)
Freedom Blues 4-Piece: Reduces the entire team's Anomaly Buildup Resistance on enemies hit by the equipping character's Special Attack or EX Special Attack. This build is specifically for Disorder teams (e.g., Miyabi + Grace + Rina) where the entire team wants to apply anomalies faster. The trade-off is losing Swing Jazz's 15% damage amp on Ultimate. Use this build only if your main damage comes from Disorder procs rather than raw crit damage.
Main Stat Priority
| Slot | Main Stat | Explanation |
|---|---|---|
| Slot IV | HP% / DEF% (survival) | Rina doesn't benefit from CRIT or ATK stats for her role. Survival stats keep her alive to maintain Bangboo uptime. HP% is generally preferred as it scales better against the most dangerous boss attacks. |
| Slot V | PEN Ratio% or HP% | PEN Ratio% directly increases the effectiveness of Rina's Core Passive buff — this is her best-in-slot for this position if you can get it. HP% is a perfectly fine alternative that sacrifices some buff potency for survivability. |
| Slot VI | Energy Regen% | Non-negotiable. Rina needs Energy Regen% to maintain near-100% Bangboo uptime through frequent EX Special Attacks. Without Energy Regen% in this slot, her buff uptime drops to roughly 60-70%, significantly reducing her value. |
Substat Priority
PEN Ratio > Energy Regen > HP% > Anomaly Proficiency > DEF%
⭐ Skill Priority
| Priority | Skill | Explanation |
|---|---|---|
| S+ Highest | Core Passive · Bangboo Support | Rina's entire identity. The PEN Ratio buff scales with Core Passive level. At Core Level F, she provides 18% PEN Ratio; at Core Level G (R6 unlock), this increases to 22%. Level 12 priority — this is the only skill that directly controls the potency of her team-wide damage buff. Every level adds approximately 1.5% more PEN Ratio to the aura. |
| S Highest | EX Special Attack | Summons the Bangboos and provides the initial PEN Ratio buff. Higher levels increase the Bangboo's duration and reduce Energy cost. Level 9-12 recommended. EX Special is the primary way to deploy Bangboos, as the unenhanced Special Attack's Bangboo duration is quite short. |
| A High | Ultimate | Replaces Bangboos with an enhanced version providing 50% more PEN Ratio for 15 seconds. A key part of burst rotations. Level 9-11 recommended for the increased buff duration. |
| A High | Chain Attack | Triggers Bangboo support follow-up and deals decent Ether damage. Level 7-9. |
| B Low | Basic Attack / Dodge | Rina's personal damage is negligible — these skills are mostly for building Energy and staying alive. Level 1-6 is fine, but don't waste resources here. |
🤝 Team Compositions
Rina's PEN Ratio buff is element-agnostic and works with any damage dealer. This makes her arguably the most flexible Support in ZZZ — she can slot into any team that doesn't already have a fixed Support slot. Below are the top team compositions highlighting her versatility.
🥇 Ether Hypercarry (Best)
Zhu Yuan + Rina + Nicole
This is the most popular Rina team and for good reason. Zhu Yuan, as an Ether Attack character, benefits doubly from Rina's Ether damage resonance and the PEN Ratio buff. Nicole provides additional DEF shred and grouping with her gravity field, meaning the enemy's effective Defense is reduced by both PEN and DEF shred simultaneously. The result is that Zhu Yuan's enhanced shotgun blasts deal damage as if the enemy has almost zero defense. Rotation: Rina EX Special to deploy Bangboos → Nicole EX Special for DEF shred + grouping → swap to Zhu Yuan who enters with the PEN Ratio buff active → unload enhanced shotgun blasts during the debuff window. This team is one of the strongest single-target burst compositions in the game.
🥈 Disorder Hybrid (High AOE Damage)
Miyabi + Grace + Rina
This team leverages the Disorder reaction between Ice and Electric. Rina's PEN Ratio buff amplifies both the Frostburn damage and the Electric Shock damage (Defense is applied before element-specific damage calculations). Grace applies Shock with her grenades, then Miyabi triggers Frostburn → Disorder proc. Rina's Bangboo auto-attacks also help chip in with Ether anomaly build-up, occasionally triggering a third anomaly type for additional Disorder potential. Rina's Energy Regen focus means she can maintain Bangboo uptime even during extended rotations. Use the Freedom Blues 4-piece variant for this team to amplify everyone's anomaly build-up speed.
🥉 Universal Flex (Any DPS)
Any DPS + Any Stunner + Rina
This is the plug-and-play template. Pick your strongest DPS (Ellen Joe, Nekomata, Soldier 11, etc.), pair them with any Stun character (Lycaon, Qingyi, Anby), and add Rina. The stunner builds Daze, Rina maintains PEN Ratio buff, and the DPS nukes during stun windows. Some standout examples: Ellen Joe + Lycaon + Rina — Ellen's massive CRIT damage numbers get amplified further by PEN Ratio. Nekomata + Anby + Rina — a low-investment team that performs surprisingly well thanks to Rina's universal buff. Soldier 11 + Koleda + Rina — Fire team burst comp with Koleda's fast stuns and Rina's PEN Ratio amplifying Soldier 11's burn damage.
🎮 Playstyle & Rotation
Playing Rina is about positioning and timing rather than complex combos:
- Deploy Bangboos: At the start of combat, swap to Rina and use EX Special Attack to deploy her Bangboo helpers. This costs 60 Energy but is the most reliable way to get near-maximum Bangboo duration (12 seconds at EX level 9+).
- Position for the Aura: The Bangboos orbit around Rina's current position. Move close to where your DPS is standing or where the enemy fights will take place. The aura radius is generous (~6 meters) but requires awareness — don't position Rina at the edge of the arena where your melee DPS can't reach the buff.
- Tag-in DPS: Once the Bangboos are deployed and the buff is active, swap to your DPS character. The PEN Ratio buff follows the ally for 10 seconds after they leave the aura. This is your DPS window.
- Refresh Buffer: After the 10-second grace period, swap back to Rina and refresh the Bangboos with another EX Special. If your Energy is low, use basic attacks to generate Energy — Rina's Bangboo auto-attacks also generate a small amount of Energy over time.
- Burst with Ultimate: Save Rina's Ultimate for major burst windows — stun phases, boss HP thresholds, or when your DPS has all their cooldowns ready. The enhanced Bangboos from her Ultimate provide +50% more PEN Ratio, turning any stun window into a massive damage window.
💡 Advanced Tech: Rina's EX Special has a relatively long animation (~1.2 seconds). Use her Ultimate to refresh Bangboos during active combat instead of EX Special when you have Energy — the animation is shorter and the enhanced buff is stronger. The optimal rotation for burst windows is: Rina EX Special → deploy Bangboos → swap to stunner → build stun → during stun window, Rina Ultimate → swap to DPS → nuke. This gives your DPS both the base PEN buff and the enhanced PEN buff stacked.
⚠️ Rina's Bangboos are destructible. If an enemy boss has wide AOE attacks, they can destroy the Bangboos prematurely, ending the PEN Ratio buff. Be prepared to re-summon them immediately if you see the Bangboos take damage or disappear. Boss telegraphs with large AOE effects (like the Dead End Butcher's spin attack) are the most common cause of premature Bangboo destruction.
❓ FAQ
They serve different roles. Nicole provides DEF shred (which reduces enemy DEF by a flat percentage) and grouping utility — her gravity field is invaluable for clearing mob waves. Rina provides PEN Ratio (which ignores a percentage of DEF for the team's damage calculation) and is better for single-target boss fights. In general: Nicole is better for AOE/mob content, Rina is better for boss fights and single-target DPS. If you can only build one, Rina has more longevity because PEN Ratio remains valuable even against the highest-level enemies, while DEF shred has slightly diminishing returns against very tough bosses.
The ideal target is 35-40% total PEN Ratio when her Bangboos are active. This breaks down as: ~20% from Core Passive (level F) + 5-8% from Slot V PEN Ratio main stat + 5-8% from substats + 4% from Weeping Cradle base stat (if equipped). At 40% PEN Ratio, a level 60 character ignores about 22% more of a level 70 boss's Defense than at 0% PEN. Going beyond 45% has heavily diminishing returns — Defense can only be reduced so far before the formula plateaus. Focus on reaching 35% comfortably, then invest in Energy Regen and survivability substats.
PEN Ratio from different sources does stack additively in ZZZ. So Rina's Core Passive buff (18%) + her Slot V PEN Ratio% (8%) + any PEN substats (4%) all add together for a total of ~30%. However, PEN Ratio stacks multiplicatively with DEF shred (defense reduction debuffs like Nicole's DEF shred or Lycaon's Ice RES shred). This means Rina + Nicole is an incredibly powerful combination — Nicole reduces enemy DEF by ~40%, and Rina ignores ~30% of the remaining DEF. The combined effect is that the enemy effectively has only ~40% of its original Defense, resulting in a huge damage multiplier for the team.
Rina is one of the few characters where Mindscapes make a significant difference. M1 increases Bangboo duration by 3 seconds (reducing the frequency of refreshing), M2 increases the PEN Ratio buff by an additional 10% (massive team damage increase), M4 allows Bangboos to generate Energy for the whole team when they attack, and M6 doubles the PEN Ratio bonus from her Enhanced Bangboo (Ultimate). M2 is the biggest single power spike — it takes her from a good Support to a top-tier one. However, Rina at M0 is already perfectly functional and clears all content. Her Mindscapes are a luxury, not a necessity. Prioritize her W-Engine first.