- "I read 'Pet the Bunny' before I could walk"
- ―Library Kid
Library Kid is a student attending Third Street School, who spends her time in the library.
Library Kid is short and skinny with pale skin and square magenta glasses. She has medium-length reddish-brown hair, a grey T-shirt, a purple skirt, and black shoes. Like Gus, she's drawn with the black bead eye style. When Gus pulled the book out he saw a white eye with a black pupil staring at him, which was the Library Kid's eye.
Library Kid is a timid and intelligent girl who spends all her time in the library. She is a linguist. She can speak French, German, Greek, Latin and Basque apart from English. She seems to look up to Gretchen as a big sister.
Ever since she could remember she loved books, she read "Pet the Bunny" before she could walk. when she began kindergarten, she was excited at the prospect of discussing her favourite books with her peers. She was shocked to see that the Kindergateners, unlike her, were loud and dirty. She ran out of fear, and entered the library. She had been spending her time in the Library until she was approached by the Recess Gang, who thought her a 'wild child' until she addressed she was a linguist. When they introduced her to recess, she began to go crazy due to her excitement of being outside, to the point where they had to bring her back into the library. She's been attending recess as well as spending time in the library
- Library Kid's real name has never been revealed.
- The only time she's shown outside the library again is in "Lawson and his Crew", the Library Kid goes out of control, but the gang calmed her down (Lawson's gang beat them to it ).