Roku's hairstyle is two long braided tails and her face is similar to an Oni (demon). She also wears a sweatshirt as a garment and she appears to be wearing black pants with possibly black shoes.
She is first seen during the meeting of Site Administrators. She is later sent alongside Juugo to kill Nana at the hospital by order of Ichi. During the fight, Nana dexterously dodged Roku's attacks, which results in the death of a nurse who was completely disintegrated. After losing an arm, Nana pretends to escape through the window, and when Roku peeks out the window, Nana kills her by shooting at her head. Roku's entire upper body is destroyed, leaving only her legs which then revert to their original human form.
Roku can release a black smoke from her hands that completely vaporizes anything it touches. Once it touches an object, it spreads through the whole object unless the affected part is quickly cut off. It has similarities with Nanoka's Pliers.
- Her name "Roku" means "Six".
- Her face/mask is based on the Hannya.
- So far, Roku is the second administrator in be killed without show a second ability like the old Ni.
- At the end of Site Episode 12, Roku speaks in a deep, male voice.
|Administrators||Ichi | Ni | San | Shi | Go | Roku | Nana | Hachi | Kyu | Juu | Juuichi|
Juuni | Juusan | Juushi | Juugo | Juuroku | Juushichi | Juuhachi
|Others||A | The King of Ancient Humanity|