Masato
A young boy who has been immortal for 800 years. He has a face of an angel, but the soul of the devil. Masato would give mermaid flesh to a woman and have her pose as his mother until she was deemed useless. Despite his childlike appearance, eight hundred years of loneliness and wandering have turned Masato into a soulless monster. His latest mother figure, Misa, actually gave him the name Masato. He found her during WWII after she had lost real son in an air-raid. Sixty years later, Mana and Yuta came across Misa and Masato, and Masato set his sights on making Mana his latest mother-figure. He drove off in a car and plowed right into a truck but it was implied that he was still out there searching for another mother.