The heroine of the series. Also known as "The Black Biker" or "The Headless Rider", she is a from Ireland who came to Japan looking for her stolen head. Her motorcycle is actually a horse in disguise. She has no heart and perceives via unknown sensors that are not located on the head. The physical strength she possesses is above human, though not quite on par with Shizuo Heiwajima. She is also capable of manipulating a shadow-like, durable substance to form objects ranging from gloves to chariots at her will.
Celty lives with Shinra Kishitani, and the two are romantically involved. She works as an underground courier. She wears a helmet when she goes out and communicates via a PDA. She enjoys online chatting, television and DVDs. She is one of the minority who knows the creator of the Dollars and that Anri is in control of Saika. Over the course of the series, her relationship with Shinra intensifies; eventually, she says that she is in love with Shinra. She has a habit of punching Shinra in the stomach whenever he talks about his love for her. She tends to get mad when Shinra says she does not need her head. Despite being a supernatural creature, she is afraid of extraterrestrials and has developed a fear of traffic officers as they started pursuing her frequently. Her biggest fear, however, is that if her head is destroyed, the same may happen to her. She is a member of Dollars.