Demigender

Demigender can be a subset of bigender of multigender, but does not have to be. [...] A demigender person may identify as demifluid or demiflux; this indicates that a part of one's identity remains stable while the other part or parts are fluid.

Demigender people often identify as non-binary.

Examples of demigender identities include demigirl, demiboy, and demiandrogyne.