|No Known Affiliations|
| Mrs. Rockwaller (mother)|
Connie Rockwaller (sister)
Bonnie Rockwaller (sister)
|No Known Friends|
|No Known Love Interests|
|No Known Pets|
|No Known Nemesis|
|Behind the Scenes|
Lonnie is one of Bonnie's older sisters, along with Connie.
Like her younger sister, Bonnie, Lonnie has a slender but curvaceous figure, green-blue eyes and the same skin tone, although like Connie, Lonnie's also taller than Bonnie is, and is about the same height as Connie. Lonnie also has a platinum streak in her blonde hair and is said to be the most beautiful of her sisters.
Lonnie has a similar personality to Bonnie, but is significantly ruder and, in many ways, meaner than Bonnie. Lonnie and Connie do not just act mean, snobby and rude to their sister, but to others as well, like Kim, as shown when Kim tried introducing herself to them. When Bonnie had introduced her sisters to Kim, she said that "they're my older sisters, way older" which left both Lonnie and Connie insulted.
Little is actually known about Lonnie's abilities, although it can be assumed that she does have some kind of talent or skill, as mentioned in Hidden Talent by Bonnie when she was signing up for the Middleton High talent show. Bonnie stated that her siblings, presumably including Lonnie and their other sister Connie as her only known siblings, had won the talent show four years in a row when they were students at the school, and that she herself had no intention on breaking the "Rockwaller family tradition". And given the fact she identified France as a city instead of a country and her claim to be the most beautiful of the two she might not be as intelligent as Connie.
- Main article: Mrs. Rockwaller
Nothing is known about Lonnie's relationship with her mother.
Nothing is ever mentioned about the father of the Rockwaller sisters.
- Main article: Bonnie Rockwaller
Lonnie, like her sister Connie, enjoys teasing Bonnie, the youngest of the three, and like Connie looks down on her. According to her, she "got all the looks", Connie "got all the brains", and Bonnie "got the rest".
- Main article: Connie Rockwaller
Lonnie appears to get along well with Connie, who she was seen with in Bonding. As the two sisters were only seen once in person, it is unknown if they hang out with each other all the time or not. Bonnie's statement in Hidden Talent about her "older sibs", presumably including Lonnie and Connie, winning the competition four years in a row indicates that they may be fraternal twins.
Behind the Scenes
Lonnie and Connie are implied in the episode, Hidden Talent, when Bonnie signs up for the Middleton High talent show, who also tells Kim that her "older sibs" had won the talent show four years in a row when they were students at the school, and she had no intention of breaking the 'Rockwaller family tradition'.