...the federal Department of Energy designed and purchased a mascot costume to warn children about the dangers of environmental catastrophe—and to haunt their dreams, apparently.... the Green Reaper—a verdant version of the Grim Reaper that manages to combine the ominous presence of the original with the vacant eyes of a cartoon character. 
documents show that the Green Reaper, which was designed in 2012, was intended to be used in "community outreach presentations to local elementary school children" and in internal memos reminding government workers to conserve energy and carpool when possible...
in addition to making appearences at schools—the Green Reaper shows up "randomly" at the National Nuclear Security Administration (NNSA).

The Green Reaper costume cost about $5,000 to manufacture... the government liked the design so much that Dawn Starett, the program manager who invented the Green Reaper, won a 2013 Environmental Stewardship Award from the NNSA