This list of mythical creatures that begin with this letter and I am constantly gathering information from each continent, and is continually being updated.
Ojancanu (Cantabrian)
The Ojancanu is a cyclops found in Cantabrian mythology, and is an embodiment of cruelty and brutality. It appears as a 10 to 20 foot tall giant with superhuman strength, with hands and feet that contain ten digits each, and two rows of teeth. With a very wild and beast-like temperament, it sports a long mane of red hair, and just as much facial hair, with both nearly reaching to the ground.
Apparently the easiest way of killing an Ojancanu is to pull the single white hair found in its mess of a beard. The strangest thing about these peculiar cyclopean species is their reproduction process. Instead of mating, when an old Ojancanu dies, the others distribute the insides and bury the corpse under an oak or yew tree.