Pom-Pom, the Astral Express conductor from Honkai: Star Rail, has wandered into New Eridu, and Hoyoverse says that is very much on purpose. The studio has confirmed a full crossover between Zenless Zone Zero and Honkai: Star Rail, teased through the little visitor now roaming Sixth Street as an “unidentified Bangboo.”
Quick answer: The Zenless Zone Zero x Honkai: Star Rail crossover is officially confirmed and begins in Winter 2026. No exact date or time has been announced yet.
When the ZZZ x HSR crossover starts
The crossover launches in Winter 2026. Hoyoverse framed the announcement as a playful “bug report,” joking that after a technical evaluation the team is temporarily unable to remove the “Pom-Pomboo” that suddenly appeared on Sixth Street. Instead of patching it out, they are turning the appearance into a celebration and a full crossover event.
Beyond the season, no specifics are locked in. The developers said only that more details will arrive through future official announcements, so there is no confirmed release date, event structure, or reward list at this stage.
Where to find Pom-Pom on Sixth Street
The teaser is already live in-game. Proxies can spot Pom-Pom wandering around Sixth Street, where it appears as a curious, unnamed Bangboo. You can walk up and interact with it to trigger special dialogue tied to the crossover.
Pom-Pom turns up in a few specific spots around the district, mostly clustered near the Random Play Video Store.
| Location | What happens |
|---|---|
| Inside Random Play Video Store | Stands near the videotape display, looking for a comic called “Pom-Pom’s Bizarre Adventure” that mentions Planacardia and carries a fanfiction tag. |
| Video Store counter | Talks with Eous, comparing their heights and ear lengths. |
| Parking lot behind the video store | Found in the corner, wanting to clean out the dusty area and boxes. |
| Outside Random Play | Asks for help trying the other Sixth Street shops and keeps cleaning to earn Dennies. |
The comic reference and the “Pom-Pomboo” nickname are the in-game hook the marketing built the reveal around, so these interactions are the earliest official piece of the crossover you can experience right now.
Leaked crossover characters: Astra Yao, Ellen, and Robin
Hoyoverse has not named any playable characters for the crossover. Circulating leaks, however, point to a three-character swap between the two games. Astra Yao and Ellen from Zenless Zone Zero are said to be heading to Honkai: Star Rail, while Robin from Star Rail would visit New Eridu.
The same leaks suggest the crossover could line up with the Honkai: Star Rail 4.7 update, and the pairing of Robin and Astra Yao hints at a music or concert theme. Robin would fit the setting easily, since Zenless Zone Zero already features several singers and stage performers. Treat all of this as unconfirmed until Hoyoverse says otherwise, including whether the visiting characters are playable or simple cameos.
What is confirmed versus what is rumored
| Detail | Status |
|---|---|
| Crossover exists | Confirmed by Hoyoverse |
| Launch window (Winter 2026) | Confirmed |
| Pom-Pom on Sixth Street | Live in-game now |
| Exact release date and time | Not announced |
| Ties to HSR 4.7 | Rumored |
| Astra Yao and Ellen to HSR, Robin to ZZZ | Rumored |
For now, the confirmed picture is simple. The crossover is real, it arrives in Winter 2026, and Pom-Pom’s appearance on Sixth Street is the teaser. Everything about the character lineup and precise timing remains unofficial, so the next official announcement from the Zenless Zone Zero channels is where the concrete schedule and roster will be settled.
