The term "Demo Thug" is conjectural. The real name is unknown, and a non-canonical nickname or title is used instead. See the reasons for this title in the "Behind the scenes" section below and/or the relevant discussion on the talk page, if they exist.
Demo Thugs were Thugs-4-Less soldiers. They wore red armor, making them less susceptible to damage than the average Thug, and threw grenades at Ratchet.