Nifty is Lifty and Shifty's 16 year old cousin.
Nifty first appeared as a cameo role in Prickly Reunion. She would later appear in a future episode involving her fear of lightning. She may occasionally act as a third accomplice of Lifty and Shifty's schemes, and accidentally be the cause of their mishaps.
She used to have a unibrow, but it was later removed.