Mark Scheffer

Mark Scheffer, also known as Shrapnel, is a former toy shop owner and serial bomber. He terrorized Starling City and endangered the life of Sebastian Blood, before being stopped by The Arrow.

Biography
In "Blast Radius" he is seen as an anti-government serial bomber who follows a militia group and the group's M.O. is how he is identified by Team Arrow when they analyze the bomb remains given by Detective Lance, currently officer but still referred to as Detective. He goes by the alias of Shrapnel but does not appear visually or physically as Shrapnel. After bombing two government buildings in Starling, Shrapnel targets Sebastian Blood's Unity Rally, he shoot's Diggle and after a brief chase, The Arrow manages to catch him and he's arrested.

Abilities

 * Explosives Creation: Mark Scheffer has be shown to be an exceptional skilled explosives creator, making timed bombs, as well as explosives that blow in a specific way.

Trivia

 * In the DC comics universe, Mark Scheffer is a supervillain by the name of Shrapnel. In the show, he uses "Shrapnel" simply as an online alias.