Lucille has an unhealthy attachment to the house she grew up in, where dwell all of her memories… so much so, she keeps murdering people so her brother can steal their money, just so they can try to keep up the wretched house! It would make far more sense to move away from Crimson Peak, yet they stay, forever locked in the red mud, drenched in an endless cycle neither of them can break (and she does not want to). The mere idea of leaving fills her with disgust. She has come up with the perfect way to keep on staying there, and that is to play out the exact same murder scenario again and again… Thomas pretending to be a romantic suitor, then marrying a young heiress, and the two of them dispatching her for their cash. Lucille assists this along through her poisoned tea or a hatchet wherever necessary. Lucille can be demure, reassuring, and charming, but also controlling and manipulative toward her brother. She likes to torment Edith a little bit, pretending to be her friend but also not leaving her alone with Thomas, in case they ‘compromise’ each other. She takes great pleasure in rubbing her mother’s nose in their misdeeds (“It comforts me to think she can see all that we do”). Lucille also enjoys shocking and horrifying Edith with the knowledge of her incestuous control over Thomas. She sees herself and Thomas as a unit that works together, and takes any threat to them seriously. Lucille makes emotionally-driven decisions; she also has an irrational clinging to her childhood home, which is not beneficial in the long term. Despite its crumbling foundations, rotten floorboards, and broken ceiling, she and Thomas continue to stay there, and pour their finances into a place they ought to just burn down and abandon. She is attuned enough to her brother that she notices how ‘different’ he is with Edith, and feels threatened by it. She doesn’t like the idea of leaving the house, or changing their lifestyle, or letting her brother go, and would rather murder him (and live with his ghost) than change.

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Lucille is very prideful in being different from other people – she lives in squalor in a house falling apart, because it allows her to control her situation and be deeply connected to her brother. She takes great delight in treating Edith cruelly and in keeping her separated from the man both of them “love”; she rubs it in her face later that she is superior, different, that Edith is nothing and insignificant. She is a creature of darkness who feeds a butterfly to an anthill, because she identifies more with the ants that survive than the delicate creature that does not. She’s also fearful of losing her brother, and never wants to leave the house; she feels connected to it, like she and its bones are the same, and is terrified of the outside world and what she might find there, so she resists any attempts by others to enlarge her world. She would rather remain a ghost, forever locked in the horrors of her earlier life, and the murder she has committed. Lucille does not feel that she can move on, heal, or that she ought to improve herself in any way; she becomes vengeful against beautiful women and uses their fortunes to pay off their debts, after murdering them.