Kuroda Hyoue is most likely Akai Tsutomu as he has been in coma for 10 years and Tsutomu has been missing since Haneda Kohji's murder case. He may have requested Zero's assistance in order to gain info about the black organisation.
Wakasa Rumi is most likely Asaka from 17 years ago due to her combat skills. She is 37 now so she was about 20 during Haneda Kohji's murder case. She may have an unknown relationship with Haneda Kohji.
Akai Mary is the Akai family's mother and an SIS agent and nothing else(maybe).
Nothing is special about these characters. They hardly appear in any chapters, give them a break.
