For those out of the loop, Willow is an old character design I made many years ago for a comic that I've unfortunately never found the time to make, at least as of yet. Her body is that of a lioness, but her true form is the floating blue spirit, which she usually carries around in her lantern.
Willow can detach herself from her body and move around in sprite form, as seen here. Her body will continue to act on autopilot (albeit a little stupidly) while she's away, but she can't stay removed for too long or her body will slowly start developing its own personality, in much the same way that Willow once did long ago when she herself split off from a larger, much more powerful creature deep in the forest, who she calls "mother".

For more see previous sketch here, and color version here.