At 17 years old, Lori is the oldest child of the Loud family, and the oldest of Lincoln's five older sisters. This is a fact she uses to assert authority and absolute dominance over her siblings. Her most annoying habit is using her phone and texting to Bobby all of the time.
Being the oldest, Lori is bossy, condescending, and has the second nastiest temper after Lola. But aside from that, she is also cute, friendly, insecure and protective. As the oldest sibling, she is supposed to act responsibly and maturely, but sometimes she doesn't act like that, and instead she behaves like her youngest sisters, like in "Left in the Dark", where she's afraid to go down into the dark basement.
She likes to keep her shoes under the bed for unknown reasons. She doesn't like the others touching her possessions, especially her cell phone, which seems to be her most valuable object. The reason for this is that she doesn't want to waste her phone memory for messages other than the ones from Bobby. She's also very territorial as she loudly yells at anyone who goes into to her room without permission before kicking them out.
In some occasions she acts without thinking, and commits malicious actions against the others for her own selfish benefits, like in "Driving Miss Hazy", but since her love for her family always comes before any petty problem, she has a caring heart underneath a rough exterior, and she will always try to fix her mistakes. Deep down, Lori is insecure and is usually frustrated with the responsibilities and burdens of having to take care of her nine wild sisters and only brother. It is also shown that while she gets annoyed and easily agitated by a lot of people, she feels lonely without the people she loves and cares about (such as Bobby and her family) and her worst fear is in fact, losing them forever.
"Lori Loud is 'literally' the oldest of the Loud children. She's the self-proclaimed boss and the only sister with a driver's license...so it pays to stay on her good side. A professional texter and avid eye-roller, Lori is never afraid to tell people how she feels."
Lori is the tallest sibling of all. She has large blonde hair (a genetic trait she shares with her mother, even though her hair is longer). Her original design depicted her with pink eye shadow, a white tanktop, navy blue shorts, and black shoes. Later it was changed with a light blue tanktop, brown cargo shorts, blue slip-on shoes, and blue eye shadow. She also wears pearl earrings.
Her nightwear includes a sky blue nightshirt, and blue slippers, but later, her current one contains a white tanktop, and small blue and white shorts, with a square pattern, as seen in "Space Invader" and "Overnight Success". Her swimsuit is a two-piece blue bikini.
In "Come Sale Away", it's revealed that she used to wear braces, a blue ribbon, and previously suffered from acne.
Her phone is a handheld object owned by her. She often talks to her boyfriend Bobby with it, but she also talks to other people from time to time, and text with it as well. A common animation goof with her phone, is that it changes colors at times.
In the alternate universe where Lincoln has ten brothers instead of ten sisters, Lori is a boy named Loki Loud. Unlike Lori, Loki is even more selfish, greedy, and is very bossy around the others. He is also mean and abrasive towards Lincoln, and mocks him for Luke (Luna) using him to clean the toilet, Leon (Lily) for biting his thumb when he gets a "boo boo", and teases him about Ronnie Anne.
However, in the dimension where the sexes of the Loud kids are the exact opposite (meaning that it's one girl and ten boys), Loki's shown to be very caring and protective of his sister, Linka--in fact, Loki's the first of the brothers to ask Linka (technically Lincoln-in-Linka's-body) if she's okay after he and the rest of the brothers heard her screaming in the middle of the night.
Loki eventually turns out to be a product of Lincoln's imagination as the whole adventure was revealed to be a dream, which Lincoln wakes up from it at the end of the episode.
The High Card
In the minicomic Deuces Wild!, Lori takes on the super heroine identity The High Card. She is one of Ace Savvy's sidekicks. Her powers are not shown, as she's only seen driving a van. In the comic, she is summoned by Savvy alongside the rest of Savvy's deck to help him and One-Eyed Jack defeat the gas monster. After they defeat it, they prepare to fight against a garbage monster.
In "Pulp Friction", she is only seen driving the van, and her abilities aren't shown.