Rubbery is presented in the form of the most common black and white eraser. She narrows from bottom to top. Rubbery is generally kind and reasonable. She is also shown to be very attentive. She is not very sociable outside of her Gang (Putty, Kurasan, Cuppy, Nansensu, Spraysh), but she willingly communicates with Knify and is friends with him. Rubbery is not very talkative and usually only speaks when necessary.