Shirako Iko, a 20 year old college student, has a calm, cool, and collected personality, often being described as "emotionless" or "uncomfortable". She's quite skilled in a number of areas due to her constant need to keep her mind occupied and occupied with activities. But, her past is quite mysterious and unknown, even within prison, and she refuses to even hint at anything about her past, though is willing to open up about the present to some extent.