ざんこ 恐子
ARuKo's companion, often seen in art together. A young girl with long blue hair and glasses, wearing a domino mask underneath them.
She may or may not be based on Da Vinci Osorezan (ダ・ヴィンチ・恐山), co-host of Tokumei Radio (匿名ラジオ) with ARuFa.
