Riff is the main antagonist of Allegra's Window.
Riff is a sneaky and often impolite cat who loves to play practical jokes on Mr. Cook. On occasion, he lies to Allegra just for the fun of it.
Riff has dark blue fur and small, black eyes. He also has a black nose and white teeth.
Riff appears in many episodes of Allegra's Window. He debuted in "My First Day at Daycare" and was last seen in "Mr. Cook's Christmas."