Stefani Stilton is the younger sister of Ralph Stilton. She is Diane‘s boss at GirlCroosh.


Stefani becomes Diane's new boss after the Hank Hippopopalous' incident and mutual interests. She is the sister of Ralph Stilton.


She is the aggressive owner of GirlCroosh, the feminist web magazine. She is usually seen on her phone and does not even stop texting when Princess Carolyn pokes her in the eye.


Stefani is a mouse with brown and white patches of fur. She wears a collared shirt in different shades of lavender with cut out sleeves at the shoulders, a pair of black shorts that are above her thigh, a gold collar lapel pin.

In Season 3 her top was dark purple and lilac.