Agent 216

Agent 216 is an assassin and a master of infiltration and sabotage. His death is the single event that set off a series of other events that led to the death of Cardinal Ravenwood, which in turn set off the Metalocalypse, and the eventual fulfillment of The Prophecy.

Appearance
Initially, he was only seen in the Klokateers uniform. It's '' revealed much later he had long brown hair in contrast to his brothers' white hair. Based on what was shown of him, he lacked scars like his brother and while muscular, lacked the deformities of his brothers 'overall appearance and the signs of premature aging. This makes him appear less "demonic" then his brother. In contrast to his brothers ' upper facial mask, he wore a bandanna that covered the lower half of his face.

Agent 216 has a tattoo that is nearly identical to the logo of the Falconback Project, how these two are related has not yet been revealed.

Past
The Masked Assassin's mother was killed during childbirth but "left him (the Masked Assassin) a brother", namely Agent 216. The pair went onto train how to kill as time went by whomever they came across in their path.

Season 1
He was recruited by General Crozier to spy on Dethklok for The Tribunal as one of Klokateers. However, Crozier had secretly recruited him as part of a plan to kill Dethklok at Dethklok's Annual Employee Conference Conference & Raffel.

He manages to infiltrate Mordhaus disguised as a Klokateer. After having his identity questioned by an actual Klokateer (and, consequently, killing him), he slips into the room in which Dethklok are holding their employee conferences. They act cordially to him but bicker amongst themselves until it is announced that the Raffel was about to commence.

He then attempts to attack Dethklok at the Raffel but is himself attacked by Klokateer, Number 216, who thought the assassin was trying claim his raffle prize (Murderface's rhino horn shaped "diamond-encrusted, titanium-base codpiece"). The two 216's get involved in a brutal fistfight, which ends in Crozier's Agent 216 falling face-first into Murderface's codpiece. This impales his head, killing him on the spot.

He is given a Viking Funeral (as all level-2 Dethklok employees receive), with the Tribunal watching via his two-way wrist-communicator. Dethklok uses him as a scapegoat for embezzlement, as Dethklok had been unknowingly embezzling from their own company. Murderface also claims dibs on 216's pension.

At some point, his body was given to the Masked Assassin with no explanation as to who killed him. General Crozier later reveals who killed him to his brother enraging him and setting off his quest for revenge.

The Doomstar Requiem
His body is seen on display during the torture of Toki Wartooth, his death fueling his brother's anger and rage at Dethklok.