She is a very naïve and innocent child, which is why Margo is so protective of her.
She thinks Gru's "dog" is cute and chases after him, despite some protest from Margo.
Most of the time, Agnes wears blue overalls over a yellow and brown striped t-shirt, and white sneakers with yellow socks.
She also wears a white ballet outfit like Edith and Margo (at the ballet recital).
Soon after, Gru adopts the girls in order to exploit Vector's love of cookies and steal back the Tim (Despicable Me) demeanour.
Agnes clings onto Gru's leg in a gesture of playfulness and heads to her new home cheerfully.
On her birthday, Agnes is wearing a dress that resembles a princess riding a unicorn. At first, Agnes is only one out of the three sisters to be excited to be adopted by Gru.When she doesn't get her way, she holds her breath until she does get her way and when she still doesn't get her way by the time she opens her eyes, she pretends to faint, and Margo implies she has done this numerous times before.Agnes has a huge love of candy, wishing her new parents to have a gummy bear house, and happily eats out of the pet food bowl Gru filled with candy.When she gets there, she also has a similar reaction to Kyle, Gru's "dog".Kyle, not used to this sort of behavior, flees in panic.She happily hugs his leg and plays games with him, while her sisters are gawking at Gru, their dream of the 'perfect parents' in tatters.