Medusa
Icon: M
Abilities: Turns dwarves into statues of legendary quality, made out of stone.
Body: Serpentine, human torso and face, snake hair, human arms.
Special: Always female
Trogdor
Icon: T
Abilities: Burninates the countryside, burninating peasants
Body: Same as dragon, plus arms.
Special: None.
Adamantine Collosus (sp?)
Icon: A
Abilities: Building destroyer, etc. Same as Bronze collosus but much, much tougher.
Body: Same as Bronze.
Special: Only shows up after you abandon a fort with adamantine, or it gets taken over.
Kraken
Icon: K
Abilities: Sea creature, ink, drowns dwarves, brings floods and rain
Body: Tentacles, squid with a bird's beak
Special: Only on ocean maps. Can't live on land for long.
Giant Dinosaur Creature
Icon: G
Abilities: Building destroyer, firebreather
Body: Same as dragon, minus wings.
Special: A common name is 'Groh'zorra'.
Floating Eye Mechanoid
Icon: O
Abilities: Flight, building destroyer
Body: Circular main body with an eye, metallic claws
Special: Black in color, shoots red and yellow beams down to destroy buildings. (Don't get it? SimCity 2000)
Giant Ant
Icon: A
Abilities: Digs
Body: A standard ant
Special: Does not directly attack people. Instead, burrows and digs random tunnels in patterns that may cause a cave in. Also scares dwarves, of course.