Gustav Patton "Gus" Griswald is the newest student in Third Street School.
He is the newest student in Third Street Elementary and subsequently becomes a member of the gang.Gus is usually naive to the rules of the playground and its traditions. Gus comes from a very disciplined yet disabled military family, causing his family to move around frequently (having attended 12 schools in six years before he began attending Third Street). Gus's surname is similar to veteran Disney animator, Chris Wahl.
Voice: Evil Genius/David/Zack
Father: Lieutenant Griswald
Mother: Madge Griswald
Cousin: Unnamed Cousin
Pets: Hoodlum (dog), Herbert (snake) and Lizard (traded to Barry)
Friends: TJ Detweiler, Vince LaSSao, Ashley Spinelli, Gretchen Grundler, Mikey Blumberg, Cornchip Girl, 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: Senor Fusion, recess, Old Rusty, being a soldier, military miniatures, chipped beef and crackers and other related stuff
Dislikes: Being bullied by troublemakers especially Gelman, troublemakers causing trouble (mainly Lawson) and being framed by troublemakers