fiona dourif (born october 30, 1981) is an american actress and producer. she is known for her role as bart curlish in bbc america's "dirk gently's holistic detective agency" and as the young diane jones in dustin lance black's "when we rise". she has appeared in showtime's "shameless" and in a recurring role on nbc's "the blacklist". she played nica pierce in the 2013 horror film "curse of chucky" and its 2017 follow-up "cult of chucky", which are part of the "child's play" franchise. in 2018, she was cast as good leader tavis in the usa network series "the purge".