Charlie Pierzynski is an original character created by ThreadbareSP on FanFiction.Net and DeviantART. She is a central character in Project B's fanfiction series Threadbare South Park, debuting in the first instalment of The Charlie Arc. She has appeared in every Threadbare South Park episode since. From the third instalment of The Charlie Arc and onward, she is fostered by the Marsh family. Partly due to her living circumstances, she becomes a peripheral member of the boys' group.