Sion

Sion is a gifted young resident of the city No. 6 and one of the series' two protagonists. After sheltering the fugitive Nezumi, he loses his privileged status and later escapes the city to uncover its crimes in No 6.

Sion's place in the story of NO.6

Sion is compassionate, idealistic, curious, and willing to risk himself for strangers. He has scientific training and analytical skill, while a parasitic infection leaves distinctive marks and altered hair color.

Sion's defining traits and capabilities

His bond with Nezumi challenges both men's moral extremes and becomes central to exposing No. 6's experiments and collapse.