It's the tail, of course.
Wunx~ was my Girl Scout camp name when I was a kid. It's Mohican for fox. I have red hair which I wore in a long braid or pony tail. Foxes have red fur and long tails, thus Wunx~.
It also makes Kitsu and me sort of related. Kitsune is Japanese for fox. (Sachiko means "daughter of bliss" in Japanese.)
Pretty cool, huh?
And I think I'm getting a little better drawing with the tablet.