Gretchen is an academically talented and extremely intelligent student, known as "Smart Girl" on the playground. A child prodigy, she has shown the ability to do many academic things that other students in her grade find complicated, and even finish a 45-minute test in 10 seconds. She is assisted by a calculator sized hand held machine called a Galileo.
Father: Phil Grundler
Mother: Doris Grundler
Friends: TJ Detweiler, Vince LaSSao, Ashley Spinelli, Mikey Blumberg, Gus Griswald, Menlo, Miss Finster, Principal Prickly, Miss Grotke, the Ashleys, Scribe Kid, Jordan and Jerome, King Bob and other good Third Street School students
Enemies: Earwin Lawson, Gelman, Conrad Mundy, Greg Skeens, Sue Bob Murphy, Lazy Kid, Chucko Kowalski, Jocko, Buster, Cheay, Koreo and Kurst the Worst
Likes: Science, Math, working, studying, space, her friends, homework, reading and coming up with plans
Dislikes: Being called dumb, her friends in danger, troublemakers causing trouble (mainly Lawson) and being framed by troublemakers