Ren is Ai's second companion, and usually takes the form of an attractive young man in a green cardigan and a black shirt. His hair covers the left side of his face and that part of his face is usually unseen. He has the ability to see the inside of a building through projecting the eye on the walls and ceilings. The large eye can also be used as a weapon through projecting intense flashes of light. When required, Ren becomes a blue straw doll. Ren's name means "one glance company". He is sometimes referred to as "Moku" or "Ishimoto Ren". His powers in human form is a reference to Daidarabotchi, a type of mythological giant that is enshrouded in shadow.
Source from Wikipeida