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Theresa Keiner (who goes by her initials T. K.) is the younger sister of Harley Keiner. Unlike her brother, she does not bully anyone other than the people she purchases from.
Theresa Keiner still has a touch of her brother in her persona. In an episode, she finds an interest in Cory, which leaves the latter in fear of Harley. She was ditched at a baseball game by her father on her 8th birthday.