Rippers are hired mercenaries who wield twin sickles. There are loyal to those who hire them. Rippers are Cleavers who have completed fifteen years of service. If a Cleaver does not wish to return to a normal life, they can chose to become Rippers. It is implied most Cleavers become Rippers.
The first Rippers were defective Cleavers. They had the same physical abilities of Cleavers, but lacked the mental component of mindlessly following orders. They wear red armour, rather than grey.
They are first seen in Death Bringer, where they are hired to guard for The Requiem Ball. Valkyrie asks if any of Rippers guarding the The Requiem Ball were going to help pursue Melancholia into the tunnels beneath the mansion. Skulduggery informs her that they are not Cleavers, only there to provide security for Gordon's Mansion. They corner the White Cleaver, but are defeated.