Honoka Mutsu, a second-year honors student at Stella Women's Academy, serves as the tactical commander for the C³ Club during airsoft matches. She directs allies and formulates strategies with a calm demeanor and sharp intellect, occasionally employing combat pragmatism like psychological warfare. Her surname originates from the Japanese battleship Mutsu, part of a shared naming convention among club members and rivals.

She possesses green eyes and matching dark green hair, typically styled in girlish pigtails, along with distinctive glasses and noticeably thick eyebrows. Her figure includes a prominent G-cup bust. During matches, she wears dark green eye protection and gloves coordinating with her hair and eye color. Her primary weapon is a Tokyo Marui G36KA2 from the Recoil Shock series, noted for its distinct firing sound due to realistic bolt cycling, complemented by a Tokyo Marui Mk IV Series '70 sidearm modeled after the M1911.

Beyond airsoft and academics, she demonstrates exceptional cooking skills recognized by peers and artistic talent in manga adaptations. Character development occurs during a bonus episode tournament where she adopts the "Field Queen" persona. She strategically modifies her appearance by removing her glasses, loosening her pigtails, and adjusting her uniform to emphasize physical attributes during audience voting tiebreakers, a tactical shift contributing to her competition advancement.