Mori is the main antagonist of the series with a resemblance to Frankenstein's monster. He is Tsukino Mori's husband and Kurei's adoptive father. He trained Kurei to suppress his emotions and become his killing machine. He is extremely rich, and longs for eternal life so he can fully enjoy all his money. He sets up advanced cloning labs and wants to get his hands on Yanagi because he believes that her healing powers can help him achieve eternal life. In the manga, he eventually finds out about and obtains the madōgu Tendō Jigoku, which is said to be able to grant its wielder eternal life.