Beth Ann Webber says:
This pattern makes amigarumi with variations including elf, mermaid, centaur and others.

Some of the modifications are very simple, like changing the ears to Elf ears or using a different shape and color for the eye surround, like these two. In warm colors is the Fire Spirit, Phoenix, from the Phoenician firebird, and in green is the Tree Spirit Canotila, from the Lakota (American Indian).

Other modifications take a little longer. These are not hard, but they are a bit more involved. Meet Melusine the Mermaid (from Medieval England) and Adhene the Centaur (from the Island of Man). In both of these cases, the Mini Free Spirit body was crocheted without the legs, and the Mermaid tail or Centaur body crocheted separately and then sewn or crocheted to the body.

I have created a pattern that has these modifications to the mini Free Spirit pattern as a series of separate changes, so you might want to use the Centaur ears and make a Cat person, or use Elf ears for a Mermaid and so on