A new leak from Honkai: Star Rail is potentially teasing the in-game appearance of the playable version of Sunday, currently expected to launch later in the Penacony cycle. While HoYoverse looks to wrap up the story of its newest world, the debut of Penacony has brought plenty of new characters to the sci-fi RPG's playable cast. Characters like Acheron, Sparkle, and Aventurine have made a major impact on the game's meta, while others like Black Swan and Firefly have quickly become fan-favorites. Now, one of Penacony's most beloved characters is being teased.