The subject is born and told they are “gender A”, rather than the alternative: “gender B”. They observe that in the world around them (media, etc.), “gender A”

The subject is born and told they are “gender A”, rather than the alternative: “gender B”. They observe that in the world around them (media, etc.), “gender A” implies X, Y, and Z traits, and “gender B” implies W, R, and T traits. The subject does not feel they exhibit exclusively X Y and Z traits nor exclusively W R and T traits, but rather some mixture of the two. The subject then has two options. Reject the worldview claiming A=>XYZ B=>WRT, in flavor of a more dynamic classification scheme; or introduce a new category, C, which maps to their experienced subset of XYZWRT. I’ve seen no evidence to support one approach being more valid than the other.