Giant Mutated Animals
Actual animals which are over-size...Example: Food of the Gods, Night of the Lepus and The Giant Mantis
Alien Flora & Fauna
Plants and animals which fill alien ecology...Example: Avatar, Alien Planet and Riddick
Demons & Dark Angels
Monsters and creatures which root in religious mythology...Example: Legend, Childhood's End Miniseries, Legion
Dimensional Monsters
Monsters and creatures which originate in a different dimension...Example: Mortal Kombat, From Beyond, Pacific Rim
Imagination/Nightmare Creatures
Monsters & creatures which appear in imagination/nightmare segments of the film only...Example: A Haunting in Connecticut, House, Insidious
Creatures of Legend/Myth
Monsters and creatures which originate in myth...Example: Red Billabog, Cerberus, Gargoyles
Automatons
Self-motivated constructs...Example: Terminator, Phantasm, Maximum Overdrive
Nano Constructs
Monsters, creatures & threats created from the use of nano technology...Example: Still rather new to the movie industry one sample could be Transcendence. Stargate Atlantis explored this with the Replicators threat.
Sentient Machines
Starships, computer systems and devices which have/gain their own motivations and control...Example: 2001 A Space Odyssey, Epoch, Iron Invader
Masked Serial Killers
Killers which wear masks or disguises...Example: Friday the 13th, Halloween, Scream
Invisible Monsters & Creatures
Monsters and creatures which you can't see or only catch a glimpse of during the movie...Example: Forbidden Planet, Island Zero
MegaVillans
Monsters and creatures which are over-the-top threats to superheros, threatening mankind, Earth or the Universe...Example: Green Lantern, Avengers: Infinity War, Howard The Duck