They are clearly humanoid and human-like even when they are transformed or at their most feral. A Bear might cause a hairier, massive Shifter, while one with a lioness’s spirit might be sleek and thin. The Shifter’s body does shift a lot based on your inner beast. The beast within does change their personality quite a bit. This animal is often based on their Subrace Bear or Boar for Beasthide, Lupine for Longtooth, feline or rat for Swiftstride, hunting animals (like owls or bloodhounds) for Wildhunt. When fully embracing this pool of instincts, the Shifter becomes animalistic for a time. The beast has a pool of powerful instincts, which is revealed and shaped by the Shifter’s personality. Whether these beasts are independent of themselves or simply a bond with nature that none else have is not for the Shifter to decide. In reality, the Shifter are beings with bonds to a beast within, a totemic force that links them to the spirits.
Their minds may be as sane as any human’s, but their primal form lurks beneath the surface, threatening to break them from civilized society in an instant. Whatever the cause, they are human-like creatures able to transform partially into a bestial form. Others say they are fey beings, lanced with magic to ensure their reliance on nature and natural things. Many simply say they are the descendants of humans infected with lycanthropy. None quite know the origins of the Shifters.