In the book, Margalo is introduced when she is found on a windstill. The Littles later adopt her, and Stuart protects her from Snowbell, by shooting an arrow in his ear. Margalo then saves Stuart from the garbage being shipped out to sea. Margalo later flees when one of Snowbell's friends, the Anorga cat, threatens to eat her, and Stuart strikes out to find her.
In the movie, Margalo was born with her siblings who died along with her mother. Her adoptive father and soon-to-be boss Falcon took her in as just to keep for himself but Margalo the youngest and only alive one got to keep a pin given to her by her mother before her death. One day, when looking for some jewelry to steal like her father trained her to do, she meets Stuart when she falls and breaks her wing.
Margalo is extremely nice and kind. Later, she became a great friend to Stuart and eventual love interest. She is also very sweet, cute, friendly, kind, lovely, brave, nice and smart, but like Stuart, can be very energetic and just wants to play and have fun.
In the book, Margalo was brown with a streak of yellow on her breast. In the movie, Margalo has golden orange feathers with a white stomach and shiny darker shade of orange nose. She has a hat on which is covering the top and back of her head. It has two straps loose on the sides and it is chest length. She has a red yarn one smaller under her hat. On the bottom of this main hat, there are two tiny silver hoops. The material is golden brown leather. She has extremely small goggles, clear on her head on top of her main hat. She owns a blue scarf, which again is very small around her neck, that is knotted but has two waist length strands hanging out.
- Margalo is sometimes thought to be the deuteragonist of the film.