Zanpakuto:(Kubikiribocho 'Carving Knife')
Kubikiribocho (Kubiki for short) has the ability to transform itself into water and the water can be used as a weapon. Later on, it developes the ability to turn into ice.
(Kubikiriboch Mizu 'Carving Knife Water')
Kubikiribocho Mizu can make the user turn into water and later on, turn into ice.