Being the oldest of the siblings, 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 she doesn't always act like that, and instead, she behaves like her youngest sisters, where she's afraid to go down into the dark basement.
She likes to keep her shoes under her 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, 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 the Loud siblings. 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 eyeshadow, 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 eyeshadow. She also wears white pearl earrings.
Her nightwear consists of a sky blue nightshirt and blue slippers, but later, her current one contains a white tank-top, and small blue and white shorts, with a square pattern. Her swimsuit is a two-piece light blue bikini.
She used to wear braces, a blue ribbon, and previously suffered from acne when she was younger. Lori used to wear glasses.
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.
Her name is a variant of the Latin name "Laura", and is the abbreviation of "Lorraine".
Her name also means "The laurel tree or sweet bay tree".
Her middle name is also Marie as revealed in The Loud House episode "Selfie Improvement".