Lynn Loud

Lynn is a 5'8" 14-year-old girl with fair skin that has warm, peachy undertones. She has thick brown hair where some of it are bangs that cover her forehead and the rest of her hair pulled back into a short high ponytail by a black hairband. She additionally has freckled cheeks and a rounded nose like her younger siblings. If doing sports, she wears a red and white jersey with a red "1" on it (her roller derby shirt), red-and-white track shorts, and black cleats with striped white knee-high socks.

Lynn is athletic and competitive. She loves to play sports and enjoys roughhousing with her siblings. She enjoys playing many different types of sports, including football, soccer, hockey, basketball, and baseball. She is also skilled in various forms of martial arts, such as kickboxing, Mexican wrestling (or lucha libre), and parkour. Lynn tends to turn everything into a competition - her siblings consider this to be her most annoying habit. She is also shown to be very competitive, and strives to be "number one" in every game she plays, even when winning isn't involved.

After Lola and Lori, she is the third most easily angered Loud sibling and is the most prone to physical confrontations.

Despite her tomboyish attitude, she shows a more feminine side on rare occasions, and takes part in her sisters' girly activities. She shows no shame in using puppy eyes to get what she wants, such as bunking in Lincoln's room.

Lynn is very superstitious and makes up absurd assumptions, such as when she told Lincoln that she never "bombs the toilet" before a big game of roller derby because it's bad luck. She is also shown to own a lucky jock and to have many unorthodox superstitions surrounding hockey. She does eventually stop being like this.

Lynn is also very immature, when she rides on carts in the grocery store and wrecks several aisles. Another example of her immaturity is where she participated in the food fight with her siblings. Another part of this immaturity is her poor sportsmanship. When she loses, she starts throwing tantrums, and if she wins, she boasts about her victory, until someone makes her realize she's hurting their feelings.

Lynn isn't above employing underhanded methods in order to win. She compliments Lincoln's wrestling ambush upon entering his room, even if it is considered cheating. Another instance occurs is when she tricks Lincoln into giving the wrong answer during a trivia game.

She may have finally learned true sportsmanship when she was put in a bad basketball team called Turkey Jerkies and since she was so blinded by winning the championship, that she forgot the real reason why they play basketball: to have fun. She even accepted her and the teams' loss with pride at the end. Also, despite being very jealous of Margo's attention, she tried her best to suppress her jealousy and try to be supportive.

She cannot handle her pride and jealousy. If she sees someone getting more attention than her, she gets extremely upset and jealous. Despite this, however, she tried to suppress her jealousy and be supportive for the sake of her friend. At the end, she finally realized that everyone takes turns being in the spotlight and started to overcome her jealousy.