Roxie Marie Callahan is Biff's niece, an intelligent young girl (in contrast to her somewhat slow-witted uncle) who has a fondness for bugs. She appeared on Sesame Street from Season 23 through Season 28. She was previously from Canarsie. Roxie often acts as a big sister to Elmo, but when he usually in curious in what she is doing and wants to get involved, Roxie tells Elmo that “[he] will get in the way.”
In her early appearances, she spoke in a high, whispery voice, similar to how the early Prairie Dawn sounded. When she became Biff's niece, she soon developed a thick New York accent like her uncle.