Shielle "Shelly" Spineback is a porcupine created by Lendri Mujina to be a deuteragonist and partner to Amialido Amdodo. Where his body is mainly ellipses, her body is mainly cones and triangles.

The more proactive one of the pair, she's known for being a poor planner who often makes rash decisions, but makes up for it by being a quick thinker. Her sharp quills often prove to be a valuable tool.

She appears to wear a skirt only, but this is an illusion; her breasts aren't usually visible outside of erotic contexts because her top blends in with her fur.