Because of her big bat ears.
And because she has these little flaps of skin where her legs meet her body. So really, it has nothing to do with Batman the superhero.
PS, these were all done, from scratch, on a Cintiq. Which I normally hate working on, but I forced myself to do it. Ugh. I'm still not converting to 100% digital for my own stuff anytime soon!
PS numéro deux, expect more of Luce, I haven't quite found the right way to draw her yet, but I'm having fun searching!
PS trois, she also bats at stuff. Badum pshhhhh.