Theresa

The Girl with Blue Vest is an unnamed background character. She played a minor role in "T.M.I.", where she asked Randy Marsh: "What's a penis?". A black haired version of her appeared in "The List" and "[[Elementary School Musical]". She is, currently, the only known student to wear a vest.

Appearance
While she was initially shown with black hair, as of "T.M.I.", her hair is brown. She wears a light orange, long-sleeve shirt, a blue vest, and a dark green skirt. She also has green hair ties, which she uses to put her hair into two, puffy pigtails.

Personality
She seems to be one of the more innocent fourth graders. An example of this is her lack of sexual knowledge, as shown in "T.M.I.". This is in contrast to most of the fourth grade girls, many of which have been shown talking about some sort of sexual relation.