In the ever-evolving world of Honkai: Star Rail, the whispers surrounding Sunday, a pivotal figure in the Penacony narrative, have grown from a faint murmur to a resonant chorus. As of 2026, recent database entries and credible leakers have painted a remarkably detailed picture of this long-awaited character, suggesting his arrival is finally on the horizon. The core of the excitement revolves around his confirmed role as an Imaginary-type character walking the Path of Harmony, a path he shares with his sister, Robin. This alignment hints at a supportive playstyle, but leaked details about his kit and signature Light Cone suggest he will be a support unit as dynamic and complex as a master weaver threading multiple melodies into a single, powerful symphony.

The Core of Sunday's Kit: Energy, Buffs, and Skill Points

According to the compiled leaks, Sunday's gameplay philosophy is built on a trifecta of team support functions. His signature Light Cone, in particular, is rumored to be the cornerstone of his design, focusing on three key areas:

• Self-Energy Regeneration: Ensuring his Ultimate is available more frequently.

• Allied Attack Buffing: Directly amplifying the damage output of his teammates.

• Skill Point Recovery: Alleviating the team's resource management, a boon for skill-point-hungry compositions.

This combination suggests a character designed to supercharge aggressive team rotations. If these leaks hold true, Sunday could become the engine for hyper-carry teams, functioning less like a simple buffer and more like a high-performance reactor core, constantly feeding energy and resources to the main damage dealer while maintaining its own critical functions.

Deciphering the Release Window: A Trail of IDs

Perhaps the most concrete evidence comes from data-mining sources like HomDGCat. A recent database entry reportedly lists a new 5-star Light Cone with the ID 23024, slated for introduction in version 2.7. The description of this item matches earlier leaks about Sunday's signature weapon. Crucially, the Light Cone for Rappa—a character confirmed for the 2.6 update—carries the ID 23023. This sequential numbering strongly implies that Sunday and his Light Cone are planned for the featured banner immediately following Rappa's, potentially placing his release in the 2.7 update.

This timeline adds an intriguing layer to another persistent rumor: that Sunday will first appear as a formidable boss in the Apocalyptic Shadow challenge during version 2.6, taking on the form of "Harmonious Choir - The Great Septimus." This would allow players to face him in combat before ultimately recruiting him, a narrative and gameplay progression as satisfying as solving a complex puzzle only to be handed the master key.

The Current Landscape and Sunday's Potential Impact

To understand Sunday's potential place in the meta, one must look at the current roster. The game's support landscape is rich, but a Harmony character who specializes in Imaginary damage and provides such a versatile package of energy, attack buffs, and skill points would be unique.

Sunday's Imaginary typing also makes him a prime candidate for teams built around other Imaginary powerhouses, potentially creating mono-Imaginary compositions that benefit from planar ornament sets like "Penacony, Land of the Dreams."

Looking Ahead: From Lingsha to Sunday

As the community awaits further official news, the game continues its march forward. The immediate focus is on Lingsha, the Fire Abundance healer featuring in the second phase of the 2.5 update. Her kit, which includes team-wide healing tied to her attacks and an Ultimate that increases enemy Break damage susceptibility, shows HoYoverse's continued innovation in support roles. Lingsha's design philosophy of combining sustain with offensive utility might be a precursor to the kind of multi-faceted support Sunday is expected to embody.

In conclusion, the leaked tapestry of information weaves a compelling portrait of Sunday. He is not merely another buffer but appears to be a conductor of combat resources, orchestrating the flow of energy, skill points, and attack power with the precision of a maestro. His journey from a rumored boss battle to a coveted playable ally mirrors a player's own progression from challenge to mastery. While travelers should always treat leaks with the cautious optimism of a cartographer examining a partly drawn map, the converging evidence points to a bright future for the head of the Oak family. The Harmonious Choir may soon have a new, playable conductor.