Nao

Nao is the second eldest son. He is the younger brother of Kio and the older brother of Mio. He has short brown, scruffy hair and a bandage placed over his nose. He is always seen wearing an oversized jacket with a mouse's face as his hoodie, and light brown shorts. His sleeves are always seen covering his hands. Nao is the tallest of his siblings.

(Source: DRAMAtical Murder Wikia)