Different Styles of Shifting
Since I've noticed that there are a few different styles of shifting out there (and since I've been trying to categorize my own shifting) I've decided to make a list of all the types I've seen out there. More will be added if I find any, but I think this is all there is?
1. Psychosomatic Changes: These are people who have changes that are mild and fairly well-explained scientifically. Increased energy, an inability to walk, heightened senses and a boost in strength are all possible for those experiencing these changes, and for the animal identified this often comes with cravings, longings to go wild, and some instincts of their species.
Unlike other forms of shifting, humans are fairly prone to this sort of change. If you've ever tried those "spell to become a werewolf" videos and felt effects (but no transformation), then you've had this type of "shift".
2. Berserkers and Human-Beasts: Changes here are more extreme than those found in psychosomatic areas, and are arguably no longer psychosomatic. These shifters often shift under pressure or the influence of spirit posession, seeing it as either a defensive mechanism or spiritual gift. The mildest of partial shifts might occur under these circumstances - growing fur, partially shifting bones, vocalizations and stance changes.
Examples of these shifters include berserkers, and some shamanic individuals.
3. Magical Influence: Those using magical influences may give off the appearance of a physical shift, without having shifted. These individuals often cast an illusion (in some cases called glamour) around their physical body so that they appear to be nonhuman. In some cases this form may be visible to only a select few; in others everyone may be able to see the animal form as if it were a physical entity.
Examples of this shift include sorcerers, witches and some claims of fae or natural animal shapeshifters (The Church Lady Monster).
4. Spirit Projectors and Bilocators: A spiritual type of shift that affects and/or involves the physical body, or materializes a new body for the shifter to use. These shifters may cross the veil to engage in fights against evil or other protective matters, or materialize a physical body to roam the Earth in. Unlike astral projection, the human body is often instrumental in shifting - moving it can displace a shifter, and a shifter may need to place it out of danger before a shift.
Examples of shifters like this include the faoladh, or the benadanti.
5. Standard Animal or Man-Beast: What most people think of when they hear of a physical shapeshifter. Changes here are fairly evident and indicate a noticable physical difference. Shifting may be painful, and difficult to initiate or control. Most shifters of this sort become an existent animal, although some may claim to have a bipedal, man-beast form. Despite being glamorized, experienced shifters are fairly rare in the community, and don't appear too often.
Examples of this shift include historical werewolves and some shamanic individuals, as well as claimed modern day sightings (such as the Torrance Werewolf) of bipedal wolf and cat men.
Not all shifters will be able to shift in all these ways, however I don't think shifting styles are exclusive. If you know one you could potentially develop the ability to shift in other ways.