Shapeshifter
Less a specific species and more a general category of species, shapeshifters are creatures capable of changing their forms. Usually shapeshifters are able to do so voluntarily, but some, like lycanthropes, often find their transformations subject to forces outside of their control such as the phases of one or more of the moons. There are two primary categories of shapeshifter: total shapeshifters and incomplete shapeshifters.
Total shapeshifters are capable of transforming into an individual of a separate species with no tells or complications. For instance, dragons are capable of turning into a perfect copy of a human, to the point that they can even interbreed with them despite their natural form being that of a reptile. Angels also fall into this category, and are capable of shifting their form to suit their preferences to the point of often taking on forms that other species find unsettling or confusing.
Incomplete shapeshifters are either limited in what forms they can take, have one or more features that they cannot fully change and which carry over into their transformed state, or else have some other limitation to their transformation ability. An example of the former is the selkie, which can only shift between their natural seal forms and another mammalian form, typically something resembling a human. They also have a tendency to fall into the other two categories as well; skin markings they have as a seal often carry over into their new forms, and they are only able to shapeshift by shedding or reapplying their seal pelt. Motte are an example of the second case, in that they cannot fully remove or hide their distinctive wings when transforming into another form, though they are otherwise not limited in what forms they can take.
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