Being a Faery, Keyfeathers is able to glamour her image to appear as other creatures. While this magic is pretty convincing, she is unable to hold these forms for long periods of time and if distracted the appearance will fade.
The creatures she is able to appear as are: Griffin, bird, dog, snake, cicada and dragon. All very tiny (no larger than a cat). Features like the keyhole, antennae and eyes tend to stay very similar to her natural faery form.
Sketch added, cause I think sketches have their own charm <3