Lynn Loud II was born on May 7, 2003, she is the fifth oldest of Lynn R. Loud and Margaret Loud, the youngest of Richard Loud III's older sisters and a member of the prominent Loud family of Royal Woods, MI. Like her brother, and their eighth cousin, Lynn L. Loud Jr., Lynn II has an annoying habit of turning everything into a sport. She is named after her father, Lynn Loud I. Her boyfriend is her second cousin, William H. Loud III, and she sometimes talks with or texts him on her phone.
Lynn II is, like her brother, very athletic and competitive and enjoys roughhousing with her siblings.
Lynn II plays every single sport: soccer, basketball, football, baseball, etc. and tends to turn everything into a sport just like her brother Richard, and is skilled in various forms of martial arts: Lucha libre, kickboxing, parkour, etc.
Despite her tomboyish personality, Lynn II is very sophisticated and well refined and also very mature since she is raised in an upper class family. She is also very religious, being devoted to Catholicism, God and Jesus Christ like the rest of her family, going to church each Sunday, and always praying before her sports games. She is also much more intelligent than her eighth cousin with a similar name and is able to speak many different languages fluently not like her eighth cousin who can speak only English and Spanish. She intends to enter politics when she grows up.
Despite being sophisticated and mature, she displays a childlike side as shown when she takes part in her siblings and cousins' antics
Lynn II has thick brown hair wrapped into a ponytail, she wears a blue and white jersey with a red "1" on it, wears blue and white shorts, but wears black shoes with white stripes and knee high socks. She is also slightly taller than her brother, who in TLLH, is Richard himself, and has freckles on her cheeks. In her original design, she wore a red and white jersey with a red "1" on it and red and white shorts. She wears gold rings on each of her fingers except her thumbs, and she wears a gold necklace with a gold cross, which represents her devoutness to Jesus Christ.
It is revealed in "A Lavish Birthday Party" that Lynn II and Willy intend to get married one week after they both turn 29 years of age, so they intend to get married a week after Lynn II's 29th birthday.