Souls

Souls are different types of memory-card-like devices used to contain a persona or a function.

Engine Souls
Engine Souls are one of two parts of each Engine as they are in Earth. The Engine Souls are inserted into Engine Casts to restore an Engine to its full-sized body. In its original large-sized body, an engine can only remain for 10 minutes before losing strength and breaking apart into soul and cast. It can also simply 'animate' the Engine cast (as seen when Speedor, in cast form, follows Sosuke).

The soul can also be used as a power-up for the Highway Buster, Junction Rifle or its combined form Super Highway Buster.

Change Souls
Change Souls were created by Bomper to armor up the Go-Ongers in time for battle. Go-Ongers are partners of each of the Engines and they need to come to battle prepared. Thus the Change Souls provide access to arsenal and enhancements. Go-Ongers 1 to 3 have blue-decaled Change-Souls, while Go-Ongers 4-5 have green-decaled ones. These souls are then 'set' into their respective transformation devices, Go Phone, Shift Changer, and Wing Trigger.

Blaster Souls
Five identical souls that attach to the Go-Phone or Shift Changers and steering wheels to provide a finishing attack for Engine-O G6.

Human Souls
As seen in an episode where Sosuke switches souls with a Bankijyu, it's revealed that a stored human soul, in this form is a simple gold non-decaled 'soul'.