Ronnie Anne is Lincoln Loud's girlfriend and Roberto's little sister. She happens to be the second cousin of Richard's girlfriend Veronica Santiago and Lorraine's boyfriend Robert Santiago Jr. She also happens to be a friend and god-sister of Richard Loud III and goddaughter of the latter's parents, Lynn Loud I and Margaret Loud.
Shortly after her birth, Ronnie Anne was baptized at St. Paul's Cathedral by Cardinal Archbishop Frederick Bottcher, Richard Loud's parents, Lynn R. Loud and Margaret Loud, stood godparents to her at the baptism, and threw a lavish party afterwards to celebrate her baptism.
Ronnie Anne is a tomboy like her second cousin Veronica although more hardcore than her. She dislikes girly things and enjoys more boyish hobbies. She has a disdain for cheesy romance, evident upon expressing disgust at the nicknames Richard and Veronica gave each other along with their kissing, she also had to deal with Lorraine and Robert Jr.'s romance as well. She is very loving to Lincoln like Veronica is to Richard, however, she shows tough love to Lincoln by putting a sloppy joe down his pants and punching him in contrast to Veronica's softer tendencies of showing love to Richard. Like the rest of her family, she is a devout Catholic and attends church every Sunday with her family.
Ronnie Anne bears a resemblance to Veronica. She is a Latin American girl with tan skin and black hair worn in a ponytail, and two buck teeth that stick out of her mouth. She wears a purple hooded sweatshirt, jean shorts, and purple shoes with pink socks, however, unlike Veronica, Ronnie Anne has freckles on her cheeks.