Lucy is the fifth-youngest in the Loud family, seventh oldest, and the oldest of Lincoln's five younger sisters. Her most annoying habit is popping up and scaring people, which is a running gag in the series. Along with Lincoln, she's the quietest out of all the 11 siblings.
They (Lucy and Lincoln) don't share the same interests but they get on well with each other; however he hates it when she scares him. Lucy sometimes asks Lincoln for help to create rhymes for her poems. Despite her "spooky" personality, Lincoln seems to appreciate her and he tolerates her creepy hobby and she's glad for his tolerance. She and Lincoln are so close that she's eager to tell him about her bad dreams as shown in "Sound of Silence". In many episodes she comes to Lincoln to ask him for proper rhyming words. In Roughin' It its revelated Lincoln makes her manicure much to her joy.
Though the seventh of the Loud Siblings, Lucy is a gloomy, cynical, deadpan, and mysterious goth girl who is almost always sporting a stoic frown. She is interested in occultism, poetry and the works of Gothic authors like Poe and Lovecraft. She has an uncanny ability to seemingly teleport to different places, which often spooks her siblings, especially Lincoln. Some of her siblings refer her as a "spooky" girl.
Though typically rather gloomy, she is shown to be happy on several occasions. She squeals and laughs in "Heavy Meddle" along with her sisters after knowing about Lincoln's romantic situation. Also in some other episodes she can be seen smiling from time to time, like in "It's a Loud, Loud, Loud, Loud, House" where she is joyfully celebrating the money finding with her other siblings and in "In Tents Debate" where she is happy that she gets the option to go to "Aloha Beach".
In "Sleuth or Consequences" it is revealed that she was responsible for clogging the toilet with her book Princess Pony, stating that even she needs "a break from the darkness" once in a while. Despite her depressed and cold attitude, she looks to enjoy being with her siblings and sometimes depart from darkness to have fun with them.
Lucy has very pale, almost chalk-white skin and her long black hair conceals her eyes. She's very thin and a bit smaller than Lincoln. Lucy dresses in black and white; she wears long striped arm sleeves, matching knee socks, a black dress worn over a striped shirt, and black shoes.
Her nightwear has a white t-shirt and striped pants. She has a swimwear that consists of a striped swimming dress with black leggings.
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