Origins
The Werehare is one of a race of creatures with origins in the mythology, legend and folklore of North America, especially within the Southern United States. One could say with near complete certainty that the Native American people of those lands were the first to encounter the creature, and take on the supernatural condition for themselves.
Appearance
As with any Werebeast, the Werehare has a singular human mien, first and foremost (one to which they return when they are not in the form of a werehare). They may be of Native American heritage, European, African, Asian, Middle Eastern, Pacific Islander or the like.
As to how the nature of human(oid) and beast is distributed within a given Werehare, it is as any other Werebeast transformation could go: the human(oid) form could merely add the weight of a mundane hare (relatively human size), or it could add the mass of a hare as proportionate to a human (larger than human norms).

"Heh heh...ain't I a stinker?
Not to mention, the specific Werehare form may be varied and assorted. There is no single breed of hare, and thus, there is no single breed of Werehare. One may be a European Werehare, a Snowshoe Werehare, an Arctic Werehare, any of various assorted Jackrabbit Werehares, Japanese Werehare, Indian Werehare, African Savanna Werehare, and many more, all based on the mundane hare breeds that share their names.
Behavior
Abilities
Laganthropy, Leporanthropy