Nezumi is one of two main characters in the manga, anime, and light novel series, No.6, and is voiced in Japanese by Yoshimasa Hosoya, and in English by Kalob Martinez.

When we first see Nezumi, he's 12 year old and very badly injured, and ends up breaking into Shion's house, where the latter offers to treat his wound, despite having just been threatened by him.

A few years later, he helps Shion escape from No.6 when he's being brought to a correctional facility and brings him to his home in West Block, showing him the world outside of No.6, sharing classical literature and theater with him, and eventually developing feelings for him.

Nezumi has blue-toned black hair tied up in a ponytail, grey eyes, and he wears a light yellow long sleeve shirt, a black motorcycle jacket over top, beige cargo pants with a ripped leg, blackish brown combat boots, and a large cloak that he wears as a scarf.

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