
In Probotector II and the cover box art for Super Probotector, his color is blue. A gray robot who also appears as an extra character in Contra 4, simply called "Probotector" in that game. Much as was the case for Scorpion and Mad Dog in Contra 4, Probotectors canonically served alongside Bill Rizer and Lance Bean during the first Galuga Island conflict.

In Contra 4, a Probotector appears as a secret character and received something of a canon update Probotector units are armed recon robots specifically used in areas normally too dangerous or threatening for humans to enter, an open reference to their appearance as the protagonists of the early European Contra games. This was presumably done due to the German Federal Agency BPjM, which banned the sales of media deemed too violent for children, including "content which glorifies war", thus requiring the change to robotic characters. The two new protagonists, RD008 and RC011, replaced Bill Rizer and Lance Bean, respectively.

When Konami released the NES version of the original Contra in the PAL region (Europe and Australia), they modified the game by replacing the original main characters and most of the human enemies with robotic counterparts, re-titling the game as " Probotector" (a portmanteau of "robot" and "protector").
