Mochizuki is a slight and unremarkable middle-aged woman. Her hair is long and straight with the dark brown beginning to show the first streaks of grey. Her small frame belies a tremendous amount of strength and speed, she is also remarkably agile for her age.

When suited up she wears a full bunraku costume, darkish-blue with a white rabbit. However, covering her face is also a very stylised rabbit mask from which she derives her name. Attached to her belt are the tools of her trade, a pair of sai and a length of rope with a grappling hook.