Electrocutioner, whose real name is Lester Buchinsky, is a criminal and mercenary from the Batman universe. He is the second person to don the Electrocutioner name and had initially worked in the name of justice before becoming a criminal. Lester wears a costume that allows him to course electricity through his body, allowing him to stun or kill his victims.
As far as video game appearances go, he has only been in two of them. The first one was Batman for the Nintendo Entertainment System, where he was the boss of the third game. His only other appearance is in Arkham Origins, where he appears as a boss during the game's main campaign.