Gujin

Gujin (愚人 Gujin), alias Erna, is a character introduced in Spy Classroom series.

Appearance
“With dazzling golden hair, and snow-white skin, she almost looked like a man-made doll. Clad in a frilly dress was one of the reasons for that. On top of that, her never talking throughout the conversations made her seem even more like a doll.”