this question raises complex ontological and existential questions, for example, "what make you yiffy"

from empirical findings (being on the internet forever) the identity of "furry" is conferred upon a being for multiple reasons such as a: having a fursona, b: describing oneself as a furry or c: beating your meat to animal people

to the best of my knowledge, within the canon of the hit series Batman by DC Comics, the titular character "Bat man" does not have a fursona, describes himself as a furry, or jacks it to fucky pictures of bowser

make of this what you will