Grim Reaper

Grim Reaper (死神 Shinigami) is a discrete member of Youtoukorou.

Appearance
Grim Reaper has yet to fully reveal themselves. Their only appearance make them appear as a shadowy silhouette.

Personality
Not much is said about their personality, but they are regarded as a criminal.

Background
Before the reincarnation of Corpse God in Polka Shinoyama's physical body, Grim Reaper along with Fire-breathing Bug and Lemmings were the three Troublemakers still active and loose in Shinjuku.

Corpse God's Reincarnation
Tsubaki Iwanome of Comp-3 mentioned the Troublemaker during a briefing of who could have been responsible for the strange incidents in Shinjuku, from the skeletons appearing in a burning building, to the Human Knot Case.

When Lemmings came to abduct Misaki Sakimiya at Youtoukorou, Corpse God under the cover of darkness attacked Lemmings to protect Misaki. The police who were at the scene were unable to see what exactly was transpiring due to the darkness, however Grim Reaper quietly slipped into the bar and was the only one who could perfectly perceive what was happening.

While interrogating the spirit of the deceased Habaki, Corpse God learned that the man was a member of the Bastard Children of Sabaramond and had given his own daughter for experimentation. The act echoed his own experience with his father who killed him for money. Lisa sensing his eagerness to punish the spirit and her own desire to met some punishment on Habaki for kill her mentor, permitted the necromancer, as he was the only one who could fulfill the duties of the Grim Reaper against a spirit.

Abilities
From their brief appearance, Grim Reaper appears to have perfect night vision and stealth skills. Based on a comment from Lisa, the Grim Reaper excels in torture and extracting information.

Trivia

 * In the Anime, the Grim Reaper is not shown to be observing the battle between Lemmings and the Corpse God.
 * The Anime shows a picture of a person of interest suspected of being the Grim Reaper, a middle age man with dark hair.