The Demon Reapers are a group of demonic grim reapers created for the sole purpose of stealing peoples still beating hearts and life essence to give to Mikes Army.
They were killed four times by the Radioactive Uber Clan but they kept on coming back to life. This time they came back to life after Bern and Reisen had a blood orgy together to bring them back to life.
They are considered to be the cousin species of the T.A.R.D Babies and it is not uncommon to see both T.A.R.D. Babies and Demon Reapers teaming up to kill innocent people.
Dr. Zitbag is currently making a device to destroy these monsters once and for all.