Yuusei Rosario di Maria

結生・ロザリオ・ディ・マリア

Yuusei is Isaac di Maria's son and Ichirou di Maraa's father. He raised Ichirou all by himself. Just like his father, he was an exorcist and a researcher. Yuusei was killed when Ichirou was younger. [spoiler] - He conducted studies on immortality - He was object of studies himself - He wasn't a normal child, he was a clone created by Isaac