- Demon - barely-sentient Cybertron underworld denizens
- DEMON - Iron Grenadier heavy tank
- Demon Swamp - Earth Crash site of the Insecticons
- Not to be confused with
- Damon Ward - founder of IMORTAL
- Demonhead - Decepticon Field Commander
- Mutant (Transformer) - brutal modern Cybertron underworld denizens
- Satan - Cobra martial artist
- Trans-Organics - similar but partially organic failed experiments of Primus