Squigly, aka Sienna Continello, was killed but brought back by her mother, who then became the Skullgirl. She is now an undead girl who is the host of a worm-like dragon parasite named Leviathan. She is particularly close to her parasite Leviathan and they are hinted to be in a relationship. She wants to stop the Skullgirl and put an end to the Medici Mafia's reign of terror on New Meridian. Squigly is a talented opera singer. Though her mouth is stitched closed, she is still able to talk.