The Unidentified Jefferson Middle School girl is a sixth-grade student at Jefferson Middle School. She appears to be popular, as she has a posse of friends. One of her friends is Emma. When P.S. 38, a nearby middle school, had mold issues at their school, P.S. 38 students temporarily stayed at Jefferson Middle School. She witnessed a P.S. 38 student, Nate Wright, break his hand at lunch time. After a few days, she asked Nate if she can sign his cast. To his display, she wrote "P.S. 38 STINKS!" on his cast.
She has black hair. Nate described her as "turbo-cute", although she is very mean.