Tuesday is an airheaded Perfection doll who acts as one of Lou's main three cronies where she spends much of her time trying to impress Lou, although it is clear that he is not interested in her. Like Kitty and Lydia, Tuesday can be very sassy, although she does also have a tendency to be forgetful and dumb. Tuesday has warm ivory skin, short light blue hair that reaches her neck, and light blue eyes. She wears a prep uniform like the other Perfection dolls

Kitty is the leader of the Spy Girls, an elite squad of three dolls who work for Lou. Like the other Spy Girls, Kitty is a sassy and sarcastic doll. However, out of the three, she is the least sensitive as she doesn't feel bad about upsetting her friends. Kitty has also been shown to enjoy doing impressions of Lou, suggesting that she's less enamored of him than Lydia and Tuesday. Kitty has rosy fair skin, light pink in low pigtails, and light blue eyes.

Lydia is shown to be sassy like the other Spy Girls. However, where Kitty is bitingly sarcastic and Tuesday is ditzy, Lydia is more emotional, crying when she finds out that Kitty stole her earrings. Lydia has brown skin, purple hair in a low braided ponytail, and golden-brown eyes. She wears a prep uniform like the other Perfection dolls. In some scenes, she wears a black bodysuit as a spy

As the most perfect one at the Institute, Lou is universally looked upon as a role model to the rest of the dolls. The dolls glorify him to the point where a cult of personality has formed around him. An egocentric and manipulative doll, Lou believes himself to be above everybody else. He tries to help all the other dolls by making them "perfect" — that is to say, more like himself. At the same time, he does genuinely believe that he's helping them eventually find a home with a human child. Lou is a handsome-looking doll with golden-blonde hair that has bangs flicked upward to the right side and blue eyes. Unlike the other perfect male dolls, he wears a full black suit and a black-purple checkered tie.

Mandy is an insecure doll who hangs out with the Spy Girls to try to fit in. Mandy finds it difficult to be mean to other dolls the way the others so easily do, since she herself isn't perfect. She has poor eyesight, which she hides from everyone, especially Lou Mandy is black doll who has magenta/purple hair in a high bun and brown eyes. She wears a black vest with two gold buttons over a white collared shirt with a blue tie, a violet plaid shorts, white knee-high socks, and black high heels. Likewise, Mandy dons' thick circular black glasses. She has lipstick on her lips and a normal perfect doll body.