[MattEmily]

As a robot? I suppose the unused mutant from "Timeranger vs GoGoV" could work. We don't know if Saban had the suit but Disney certainly did since they used it with Deviot's head in order to make a cameo monster. However it depends on when they were going to shoot this... If they shot it around the time they were doing MMPR3 and VRT2 then they would need to use 1 of those monsters. Even an unused Ohranger monster could have worked since they did end up using the Police Office in "Ohranger" for the monster in the Ninja Turtles/Space teamup.

Edited: I think Chief Officer Jiaxu looks robotic enough but only the full suit. We know they had the suit, we just don't know if Saban actually kept it or not since it was a Dairanger suit and you never saw Dairanger stuff after MMPR ended excluding the White Ranger suit (and I think Saba) in the Power Chamber case.

Iron Face Zhang Liao would also be a good possibility however he didn't have a full helmet.
Silent Knight would also be a good option but I don't believe he had a full helmet either. But we don't know if they even had the Silent Knight suit or not.

Kakuranger's Shirouneri also kind of looks... well kind of robotish.

Nopperabou would also be a good option.

Yukionna doesn't look too bad. She could pass as a robot.