She watches in delight as Mikuni sees through the lies of people and puts them to death. She also experiments on people to her delight and loves to be insulted by them while she does it. At one point, Momoko refers to as a sadist. She used to be prejudiced against Miiko initially but as time passed, she acknowledged Miiko as a comrade. She tries to end her live to enable Mikuni to become the successor of Atlas but is rescued by Momoko.
It is later known that she had a daughter who died from the same disease that Mikuni has and Mikuni reminded her of her. Shogō Kudo is also revealed to be her half-brother.
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|Hōjō Kuniko | Hōjō Nagiko | Takehiko | Momoko | Miiko | Yuri Gamagori|
|Naruse Ryōko | Z4 | Kusanagi Kunihito | Hōjō Nagiko | Sergei Talsian|
|Ishida Karin | MEDUSA | Zhang | Klaris Lutz | Sergei Talsian|
|Mikuni | Sayoko | Miiko|
|Broker Trio | Hiruko | Canary|