Suhara and Hideo

Before he joined VILE, he started off as a delinquent named Suhara. He was raised by his older brother, Hideo, who lived a responsible life as a scholar of Japanese history. Suhara, meanwhile, eventually went down a path of darkness that would mold him as the criminal stealing artifacts. That man was known as Shadowsan.

Example of:
Foolish Sibling, Responsible Sibling