Joanie Louise Cunningham is a fictional character, played in an episode of the anthology series Love, American Style by Susan Neher and on the sitcoms Happy Days and Joanie Loves Chachi by Erin Moran. She was the daughter of Howard and Marion Cunningham, and the younger sister of Chuck Cunningham and Richie Cunningham.
Chachi had a crush on her, and they moved off together into the spin-off show Joanie Loves Chachi. Later, after Joanie Loves Chachi was cancelled, she and Chachi returned to Happy Days and eventually married in the series finale.
Fonzie affectionately referred to her as "Shortcake", and, like her brother Richie, Fonzie looks after her well-being. One such notable case occurs in Season 11, when Joanie takes a teaching job at the high school where Fonzie and Roger are faculty members. An obnoxious student tries to hit on her and Fonzie comes to her rescue. There is another related event that occurs in Season 4, when an arrogant classmate of Joanie's beats Joanie out of cheerleading tryouts; and even though Fonzie is overtly tired from pushing his broken-down motorcycle home, he helps Joanie retaliate by beating her cheerleading rival in a dance marathon. Also in Season 4; Fonzie, Richie, Potsie, Ralph, and Carmine Ragusa (from Laverne & Shirley) defend Joanie's honor against a troublesome gang called the Red Devils (see "Joanie's Weird Boyfriend" from that season). She often complains about being sent to her room.