Nadine Flumberghast

In the series Arthur, Nadine is D.W.'s imaginary friend. She is an anthropomorphic squirrel with white hair in three pigtails (although she is not old) and wears a blue dress. In contrast to D.W., Nadine is calm and soft-spoken. She often gives D.W. advice, though she rarely takes it, and she only appears when D.W. is alone. Judging by her size, her age is about the same as D.W.'s. She was introduced in D.W.'s Imaginary Friend in the series, although she appeared in D.W.'s Baby, which is a prequel to that segment.

The roller coaster inspired by her name is also called Nadine's Huge Dragon

"I don't know anything you don't know!"

She did not appear in the 2010 CGI Abby's Flying Fairy School [film]. and she did appear in My Summer with Arthur and she has a personal ride called Nadine's Huge Dragon