Akira Mochizuki (played by Kie Kitano) is a protagonist in Double Meaning.
A new female detective who joins the special investigations team, facing difficult cases and personal challenges. Kyosuke Motosonobe (played by Koji Yamamoto) appears in Double Meaning.
A senior detective and mentor figure, providing guidance and support to the team. Tetsuo Yamaji (played by Susumu Terajima) appears in Double Meaning.
A veteran detective with a pragmatic approach, sometimes clashing with newer methods. Ryota Iwasaki (played by Yuma Ishigaki) appears in Double Meaning.
A detective with a keen eye for detail, often handling technical aspects of cases.