“Every actor was given extensive biographical folders written by del Toro with information that could not be shared with their co-stars. The biographies detailed each character's backstory, even information that will never make it into the film. For example, Chastain read aloud from her personal notes for us, in which del Toro described Lucille as possessing the following traits:
"Positives: Loyal, determined, intelligent, meticulous, decisive, observant, eloquent, artistic, passionate, sensitive, delicate, protective, unwavering;
Negatives: Insular, narcissistic, violent, domineering, possessive, agoraphobic, germaphobic, vengeful, jealous, manipulative, depressive, demanding, suffocating.
Secret dream: To never leave Allerdale Halle (the house);
Likes: The smell of tobacco, the taste of very bitter chocolate."
The information that del Toro had given her in that notebook included multiple sticky-pads, photographs, and random notes. Classified information.”