Reaper is a grim reaper enemy that appears in the Balloon Fight! segment of the level Pro Wrabobo.
Reaper is a blue grim reaper that is a common enemy from the NES game, Kid Icarus.
In The Game
A single Reaper can be seen on the ground, if Abobo encounters it the Reaper will screech, and summon his Reapettes. If you defeat the enemy before the Reapettes come out, you will be rewarded with the "Reap This" medal.