Fuji is a red bi-coloured Akita Inu with typical urajiro markings. She wears a rather thick collar with a buckle and small round buttons on it. In the anime, she's brown and white, with white markings on her face, chest belly and tail, completed with white socks instead of her original markings. She wears a brown collar with a golden buckle and details.
She acts very caring and loving towards Gin and his two siblings. She loves her puppies a lot, but respects their decisions and understands them, which is seen when Gin leaves.