Firefly is one of the most anticipated units in Honkai: Star Rail's Penacony arc, primarily due to the her involvement in the Trailblazer's story, however also due to her combat style. Also known as SAM, she is designed as a main DPS unit for the team composition, and as a Fire unit on the path of Destruction, Firefly excels in depleting enemy Toughness and executing powerful Super Breaks, similar to the Harmony Main Character.