She usually changes her hairstyle and is cared for by McBean's Cleaning Service, The Smiling Dragon Clothes-Folding Co, Marion's Bathroom Supplies, The Home-Cooked Meal Co, Smith & Smith Pillow-Plumping And Curtain Drawing Technicians, The 1000-Strong Lightbulb-Changing Co and The Door-Handle Shiners Inc. She is a little detective.

[4] In the book, he disguises himself as a dog named Bimby Bottlenose II, Emperor of Heligoland, Pedigree Norwegian Lapdog (to which they called him Nosey).

The company's dogs usually run away from their owners and back to the Yellow Cat with a map containing information about where the money and jewels were.

She is friends with Butch Hilburg, Rupe the Fang, Snarler McMurtagh and The Sundance Pup.

Yellow Cat was finally caught at the end of the book, after trying to steal from Ottoline's parents.

He dresses up as Lady Ursula Jansen-Smith, to try and buy "Bimby" (Mr Munroe) from the Yellow Cat.

They refer to Ottoline as "O", and call each other Ma and Pa. Pa is mentioned in the postcards, but he never writes her one himself.

Ma and Pa send Ottoline gifts from many companies to take care of her.