Theory: the cat used to make catbat was female and since it was the "dominant" half. (It comes first in their name) catbat is non binary formerly assigned female. They're chest should be small but not completely flat more like a reduction as opposed to an ectomy, with a slight curvature of their hip to waist and female genitals but a sharp protruding face. Large hands and feet, and thick but muscular limbs.