Aqua is a young, 4 year old kid who recently had her mother stabbed and killed in front of his eyes. He has a Sister named Ruby and her mothers name was Ai. He is a former doctor in his past life and he cringes thinking about his old life. He also never revealed his old life to anyone, including his sister which he believes (and is) his former cancer survivor patient in her past life. The director described him as "Scary" and did a excellent job on doing a scary role while being himself.