Kitsune

The monster harmless by appearance, yet dangerous by their capabilities. Kitsunes or fox-boys are known for their rather meek and almost feminine appearance, although underneath it - they can be just as cunning and mischievous as any monster.

Furthermore, their habit of appearing innocent has a way of lowering the guard of any whom try to hunt or fight them. Even then, their pure nature has been the reason of one or more 'hero' or 'savior' being corrupted by their new lovers.