At 8 years old, Lucy is the fifth-youngest child of the Loud family, 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 Loud siblings.
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. She frequently uses words to describe her actions, such as saying the word "Sigh" instead of actually sighing.
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". She is also shown to be rather compassionate, as she shows sympathy for Lincoln's dilemmas, and always shows her appreciation for his kindness.
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 Loud loves all things spooky and dark. She can usually be found reciting her moody poetry, or sharing her morbid point of view. If you haven't seen Lucy in a while, don't worry...she has a knack of mysteriously appearing when you least expect it!".
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, and she wears long striped arm sleeves, matching knee socks, a black dress worn over a striped shirt, and black shoes.
Her nightwear is a white t-shirt and striped pants. Her swimwear consists of a striped swimming dress, with black leggings.
In the alternate dimension where the sisters are boys, Lucy's counterpart is a male goth named Lars. Like Lucy, he shares the same room with Lynn, but also shares with Lincoln (as Lincoln's original bedroom is still a closet), and instead of a bed, he sleeps in a coffin. Unlike Lucy however, Lars is disrespectful towards Lincoln, obnoxious and agressive, as shown when the latter accidentally scratches his coffin bed after getting a rude awakening.
Eight of Spades
In the minicomic Deuces Wild!, Lucy interprets the superheroine called The Eight of Spades, who is also one of Ace Savvy's sidekicks. She uses a shovel with a spade shaped head. In the comic, she is summoned by Savvy (played by Lincoln) alongside the rest of Savvy's deck (played by the rest of her sisters) to help him and One-Eyed Jack (played by Clyde) to defeat the gas monster. After they defeat it, they prepared to fight against a garbage monster.
The Eight of Spades made another appearance in the comic Lincoln wrote in "Pulp Friction". In this appearance, she dug a hole in which two thugs were thrown into by The Night Club's music.