She was originally going to be a cat, but she seemed cooler as a bat. Of course, I think I also had Rouge (yet another Sonic reference) in the back of my mind. @_@ Actually, I was thinking about it in the first place because I was musing about the 'errors' with the characters. In Knuckles case, echidnas don't have black noses and probably don't have teeth, either. (Of course, I don't care all THAT much.) In Rouge's case, her wings are seperate from her arms (which is understandable, I guess), and her tail doesn't appear to have membranes connected to it. Then there's the thing about her not having fur in places besides her head, and Sonic's having 'naked arms' while Shadow, to compare, is completely covered in fur. Different species of hedgehog, perhaps?
I'm not complaining; I just have fun analyzing trivial things. >:P Now that I've confused everyone, especially the people who have no CLUE who I'm talking about, I'll shush up.
Funny I drew this the day before Halloween. It's just a coincidence, I swear.