Roidmude 054 was among the Roidmudes modified to be a member of the Reaper Legion created to replace Mashin Chaser as the "Reaper" of the Roidmudes.
Roidmude 054 was dispatched alongside Roidmude 034, and Roidmude 104 by Medic Roidmude to cover Chase's escape from the Special Investigation Team. The Reapers fought against Kamen Rider Mach, but 104 was destroyed by Kamen Rider Mach's Signal Kaksarn-powered Beat Macher, Medic and the Reapers abandoned him.
While Medic picked up Chase as Shinnosuke was recovering from the whiplash of Type Formula, the remaining two Reaper Legionnaires were sent by Medic to fight Kamen Rider Mach in his Deadheat form. Both were destroyed by Deadheat Mach with a Heat Kick Macher.