|Planning Department Chief Marble|
|Rōmaji||Kikaku-bu Shunin Māburu|
|Alternate Names||Dr. Marble|
|Occupation||Real Account Member|
3rd Death Game Organizer of Real Account Tower
|First Apperance||Chapter 97|
"How about it Mukai? This is the reality! "I wanted to lives and studies at school together with my best friends"? Ha... You dare to say that! It's so funny that I can't hold my laughs alone! Friendship and cooperation is just a surface, the things that important to them are nothing more than their own life! You guys are not fitting at living at school, but better fitting at live in a garbage dump!"
– Planning Department Chief Marble after every players runs for their life, Chapter 106
Planning Department Chief Marble (企画部主任マーブル, Kikaku-bu Shunin Māburu), also known as Dr. Marble (ハカセマーブル, Hakase Māburu), is one of the Real Account members and an antagonists introduced in third part of story.
Chapter 71-185 (Third Season)
- Dr. Marble is the first Marble that isn't killed by Marble himself but it was killed by Yuuma.