Core body
From Transformers Wiki
Seemingly the base form of a Transformer, the core body appears to act as a skeleton. It lacks additional armor that Transformers would normally have, to the point that the Spark chamber appears to be exposed.
Additional exostructure can be added to the core body, such as Protoform and/or scanned vehicle parts.
Toys
Trans-Scanning
Japanese-only releases, these figures are spindly skeletons referred to as "Core Bodies". To these skeletons, two sets of armor pieces can be attached to create one of two forms for either character: their protoform mode or their Earth mode.
