Jane Thursday is a special agent of the FBI.
Jane is an African-American female with short, black hair. She wears a greenish-gray jacket with its sleeves rolled up and a green shirt underneath, along with a skirt and shoes which are a darker shade of green. She has yellow triangular earrings.
A Pup Named Scooby-Doo
She was investigating Stinkweed's robberies at the Coolsville Mall and was certain that Vincent Thorne was the culprit. Her sneaking around made her a suspect, but she turned out to be innocent and arrested Vincent Thorne after he was unmasked as Stinkweed. 
- Her name may be a play on Sergeant Joe Friday of Dragnet.