Aikurou Mikisugi

美木杉愛九郎

A mysterious male teacher who develops an interest in Ryuko soon after she arrives at Honnouji Academy.

He is secretly an operative of the terrorist organization Nudist Beach, working to prevent Satsuki Kiryuin's influence from spreading any further. He also knew Ryuko's father before he was murdered. Has a tendency to strip, as fitting with his organization's name.