HoYoverse confirmed a two-way crossover between Honkai Star Rail and Zenless Zone Zero. Astra Yao and Ellen Joe arrive in Honkai Star Rail Version 4.8. Kafka and Robin head to Zenless Zone Zero in Version 3.4. Official kits remain unrevealed, but community predictions draw from existing roles and teaser footage.

Hsr X Zzz 3

Confirmed Character Reveals

Honkai Star Rail Version 4.8 brings Astra Yao and Ellen Joe from New Eridu. Teasers show Ellen using her signature weapon for Ice damage via Sharknami attacks. Astra enters her Idyllic Cadenza state, pointing toward support utility. The update is expected around early 2027 after Version 4.7.

Zenless Zone Zero Version 3.4 adds Kafka and Robin. Official art appears in the ZZZ style. Version 3.3 launches October 21, 2026 with Phoenix and Severian, so 3.4 should follow in late November or December 2026. No elements, specialities, or full abilities are confirmed yet.

Kit Predictions for HSR

Ellen Joe is widely expected as an Ice damage dealer. Her Attack specialty in ZZZ and the Sharknami teaser support a Hunt or Destruction Path. Some players speculate she could be a free unit, though this remains unconfirmed. Astra Yao is predicted as a Quantum or Imaginary support on the Harmony Path. Her Ether Support role and Cadenza state suggest team-wide ATK or damage buffs that could pair with follow-up or ultimate-focused teams.

Kit Predictions for ZZZ

Kafka’s Lightning DoT focus in HSR leads most predictions toward an Electric Anomaly Agent. This would fit her detonation style and pair with existing Anomaly units. Robin is expected as a Support Agent, likely Physical, given her Harmony Path and buff-heavy kit. Some theories lean toward a Defense specialty or Wind element, but these are less consistent. Both could arrive as limited Agents with signature W-Engines tied to their original themes.

Until official kits drop, these predictions remain speculative. Players should save resources for both sides of the collab while watching for further teaser details on gameplay and banner structure.