You can call hm Ryo,Ry,Ryoshi doesn't matter
**STORY** When Ryo was a kid he lived in an orphanage, he didn't have any parents and frankly didn't need any, his parents gave him up when he was young...he was always bullied and always got into fights, he did his best to protect his sister, and one day when a kid was picking on Kira he snapped, days later he stalked the kid for days, until finally he killed him. No one ever found out who killed the kid...Later on when he turned 18 he joined the army hoping to get away from his past. The army only made him worse, he became cold and reckless, the war and the violence drove him insane and he left only to find his sister went missing (I will explain Kira's side of the story later) He turned to hunting and never went back...that's when he went completely insane and started killing people instead of animals...later on he found his sister was alive and they we're reunited. They both then started killing together. They hunted pasta's instead of humans and that is which what got them both thrown into prison.