*She is portrayed as second-in-command to Jay and assumes leadership duties when needed.

Her mentor is Persephone.

Theresa is a teenage girl who has a slender build. She has long, wavy orange hair with yellow streaks. The hair strands on the top of her head are on both sides respectively at times (left side in promotional art) and her eyes are green. She usually wears a scarlet red tank top, blue jeans tied with a brown belt and flat white shoes.

Theresa is generally rather peppy and cheerful. She cares greatly about her friends and allies and often does what she can to help them in nearly any situation. When first brought into the world of being a hero, Theresa was somewhat excited and relieved as it gave her a chance to escape being a "bored rich girl". However, as their battles against Cronus continued and took time away from their personal lives, Theresa began to grow resentful of this life as she felt it was robbing the seven teens of a chance at a normal life. As she appeared to be the only one of the teen's to feel this way, she was not able to properly release her anger and began blaming all of the deities for circumstances.

During certain points, Theresa acts somewhat motherly as she usually takes it upon herself to scold or teach a lesson when one of the other teens picks on another.

Theresa's dad owns cattle ranches across Canada and is stated to be a very successful entrepreneur which causes him to be preoccupied with his work leading to a lack of attention towards Theresa. Theresa's family is very wealthy, therefore she is used to the finer things in life, much like her mentor Persephone. She was test-driving her new sports car which was a birthday present from her father when the envoys from Cronus and Olympia arrived and was noticeably less than enthusiastic about the Olympia dorms. Theresa earned a black belt in taekwondo at 12 years old, she has excellent fighting skills and is usually armed with nunchucks. She has a natural sense of direction, as well as a sixth sense, enabling her to sometimes foresee the outcome of events.*