Lulu is a young monster who appeared on Sesame Street for a few seasons, from 2000 to 2003. Her character design changed dramatically over the short period of time she was featured on the show; at least three distinct versions were used.
Episodes in which she features prominently include Episode 3900 in which she writes a story with Elmo, and Episode 3920 in which she makes up new words to her favorite song. She also has her own Dolly named Miranda as seen in Episode 3910.
One notable episode aired in 2002 in which Lulu takes up a fascination with Ms. Camp, the local postal carrier. After following Ms. Camp around to learn about her job, Lulu wears a post office uniform and tries out her new career. She also features prominently in a 2002 episode where she wears glasses.
Lulu later became a regular background monster, seen in Elmo's Christmas Countdown. She appears in a a 2009 episode where, referencing her recent absence, comes into frame and says, "Hey, I remember you guys!"