Dr. Kuseno

Dr. Stench is a scientist of justice, who transformed Genos into a cyborg.

Plot
4 years ago, Dr. Stench passed Genos' destroyed hometown, pursuing the mad cyborg who rampaged it. However he took Genos with him, who begged to transform into a cyborg, to which Dr. Stench complied to and modified him into a cyborg. He was promised by Genos that he would find the mad cyborg and destroy him.