PolyMorph

A PolyMorph is somebody who does not have a set theriotype (or kintype). Polymorphs constantly fluctuate, though sometimes they keep a theriotype/kintype longer than other times.

KinFluid

KinFluid is an Otherkin-specific variation of PolyMorph, and is sometimes utilized to keep a separation between the two identities, especially one is both a Therian and Otherkin, but does not have a fluid identity in both identities.