Hijiki (ひじき, Hijiki) is the vice-captain of the East City Police special forces unit.
Hijiki is a fairly tall, slender woman with narrow bean-shaped eyes, thin eyebrows, and lipstick. Like the other members of the East City Police, instead of wearing a conventional police uniform, Hijiki wears an Edo-period shinobi shozoku (ninja uniform), consisting of a hood, a headband with a metal plate reading "Police", a sleeveless kimono, wrist-bands, baggy hakama bound at the calves with cloth greaves, tabi socks and straw waraji sandals. She also carrys a katana on her left hip.
Jaco the Galactic Patrolman
Main article: Jaco the Galactic Patrolman Hijiki is brought to Omori's Island by Boat along with her comrades Hondawara, Asao, and Mozuku for an assignment led by Tamagoro Katayude which is to capture the mysterious Mask Man that was causing trouble in East City. When arriving on the island, she is seen holding a Gun during Katayude's conversation with Tokunoshin Omori. When Jaco, the real identity of the Mask Man shows himself, he quickly does away with Hijiki along with the other special forces members and pushes them all off the docks so he can go save Tights who was in danger of the Twinkle 8 malfunctioning. While Jaco is flying his spaceship to save Tights, Hijiki along with the other special forces members are seen still on the island watching through sets of binoculars. After Jaco, Omori and Tights arrive back on the island after the successful rescue, Hijiki is seen saluting along with the other members and forgiving and thanking Jaco for saving the city from the Twinkle 8 crashing into it.
- Hijiki, Hondawara, Asao, and Mozuku vs. Jaco
- Her hobbies are jet-skiing and calligraphy.