Dio Husbando

Dio is a robot built identical to Casshern in order to pro create alongside Leda. Dio's original existence was a failure and so he was then utilized for his extreme conditioning to be a killing machine for Braiking Boss' empire alongside Casshern. During their lifetime, Casshern was always one step ahead of Dio causing him to becoming continuously envious of him until the very day Casshern murdered Luna. After the Ruin began due to Luna's death, Dio left Braiking Boss with Leda as they hunted for Casshern, Leda manipulated Dio into creating an army to once again rule the planet. Soon they found out about the rumors of Luna and used this as a chance to use her in order rule the world and end the Ruin. Even through all this Dio only wished for revenge against Casshern, above all else he only existed for violence. Dio finally realized Leda's manipulation and freed himself from her grip allowing him to finally enact his revenge. In Dio's final battle with Casshern, his heart felt a burning passion that Leda's dreams of eternal life could never replicate, this passion allowed Dio to defeat Casshern in that moment he had always lived for. After fulfilling all his desires, Dio allowed the Ruin to claim his life after living it to its absolute fullest. (Source: Casshan Wiki)