Early prototypes of these machines were originally designed with a skull like head, appearing to operate as robots rather than mechs.
The Enforcer Prototype was an early blueprint of what would later become the Enforcer. While blueprints of this machine was similar to the current model, the early prototype lacked a dome for a Drophyd to pilot, rather it contained a skull like head instead, suggesting this Enforcer was a robot rather than a mech. This early Enforcer model was originally designed by Tachyon with the aid of Lombax technology, under the request of Azimuth to build weapons in order to protect the Polaris Galaxy. Tachyon; however, had no intention of aiding the Lombaxes, rather he planned to render them extinct for what they did to the Cragmites. When Tachyon was able to obtain the Raritanium needed to buy the Drophyds' loyalty, he modified all existing models of the Enforcer by removing the skull-like head and replacing it with a dome for a Drophyd to operate.
Obsidian Enforcers were upgraded version of the Enforcers encountered on numerous first on planet Reepor in the Cragmite Ruins. They were galvanized with Raritanium, making their armor tough enough to even withstand multiple shots from the Alpha Cannon.
- Although the Enforcers were not fought on planet Kerwan, one was briefly encountered after a warp pad, and then hopped away leaving Ratchet to fight the Drophyd troopers on the balcony. However, if a Groovitron was deployed before the Enforcer hopped away, it would remain there and continue to attack Ratchet like normal, although it could not be damaged by means of weapons or devices.
- Another Enforcer that was seen on Kerwan could actually be killed; this Enforcer was seen hopping from building to building as Ratchet took a warp pad to the sky bridge, before firing several shots and leaping away. However, if one was to deploy a Groovitron before jumping onto the warp pad, the Enforcer would leap right into it, causing it to stop and begin dancing mid-jump and fall to its death.