Mark Scheffer

"It's not only prisoners who grow coarse and hardened from corporal punishment, but those as well who perpetrate the act or who are present to witness it."

- Mark Scheffer

Mark Scheffer, also known as Shrapnel, was a former toy shop owner and psychotic serial bomber. He terrorized Starling City and endangered the life of Sebastian Blood, before being stopped by The Arrow. He was later drafted into the Suicide Squad by Amanda Waller, but after disobeying orders and trying to escape, he was killed by a bomb implanted in his head.

Season 2
In, he is seen as an anti-government serial bomber, who follows a militia group. The group's M.O. is how he is identified by Team Arrow, when they analyze the bomb remains given by Officer Quentin. 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, shoots Diggle and after a brief chase, The Arrow manages to catch him, and sever the activation button for his devices. Then he is arrested.

In, Shrapnel joins Amanda Waller's Suicide Squad but eventually abandons Deadshot on a mission and attempts to escape, only to be blown up by Waller who implanted an explosive chip in his head.

Personality
Mark was a complete psychopath who believe that all government is corrupt, however, he had a complete disregard for innocent lives, he was also a hypocrite, who put innocent lives in danger. He was also arrogant? or not very intelligent?, when A.R.G.U.S. recruited him for Task Force X, believing that they would just release him from prison without having him on a leash, when he try to abandon Task Force X; this attempt led to his death by the immoral Amanda Waller.

Abilities

 * Explosives creation: Mark was shown to be an exceptionally - skilled explosives creator, making timed bombs, as well as explosives that blow in a specific way.
 * Skilled marksman: Mark was shown to be skilled in the use of firearms.

Equipment

 * Flashbangs: Mark used highly sophisticated flashbangs to blind his enemies, even once attempted to use it on The Arrow.
 * Smoke Grenades: Mark used smoke pellets to escape his enemies, which was how he was able to escape The Arrow when they first crossed paths.
 * Grenades: Mark also kept regular based grenades as he attempted to kill innocent civilians with one at Sebastian Blood's Unity Rally.
 * Gun: Mark was proficient in using a gun, and  used this a gun to threaten and shoot John.

Trivia

 * In the DC comics universe, Mark Scheffer is a supervillain by the name of Shrapnel, a being of organic metal who can explode and reconstitute his body at will. In the show, he uses "Shrapnel" simply as an online alias.