This list of mythical creatures that begin with this letter and I am constantly gathering information from each continent, and is continually being updated.
Vilkacis (Latvian)
The vilkacis is a werewolf in Latvian and Lithuanian mythology. Vilkacis litterally means "wolf's eyes" 'werewolf'. It is a human that shapeshifts into a werewolf, however it is not clear wether there is a physical transformation or the soul enter the body of a wolf. Some tales mention an apparently asleep person who appeared at miles "running like werewolf", after what the person turns out to be dead, as the soul couldn't enter the flesh to return.
In the Latvian teikas and fairytales is sometimes told, that you can turn into vilkacis, if you have a wolfs' fur - you simply put it on and then say some words, and - voila! - you are a vilkacis. But in the times of witch burning women could simply be accused of witchcraft, if the fur was found in house.