|[List of appearances]|
Theresa has long new dark red hair which is braided at the back. At the top and at the start of the braid there's two holes to place accessories such as bows and crowns. Theresa has light nougat skin. Theresa has curved black eyebrows over her amber eyes. Theresa has a small button nose in the centre of her head. She has a closed smiling mouth which is decorated in bright purple lipstick. Theresa wears an aqua riding jacket. It has a low neckline, white collar and a single white button. Theresa has aqua sleeves over her arms, her hands are bare leaving them light nougat. Theresa wears white jodhpurs and black riding boots.
Theresa works at the summer riding camp as an instructor. Theresa is passionate about teaching and helping her students learn about horses. Before she allows a student on a horse Theresa educates them. She teaches them about the parts of the horse and how to mount and dismount properly. After she teaches the student how to ride a horse she gives them grooming tips. At nights Theresa hosts campfires. Theresa believes she has the best job in the world. The main characters of the theme, Andrea, Emma, Mia, Olivia and Stephanie all look up to Theresa as she's sophisticated and elegant. Theresa likes marshmallows, sushi and Thai food. Theresa loves horses and her favourite is Foxie. She also loves hedgehogs, particularly Oscar. When Theresa is seen outside the summer riding camp she's at one of the most glamorous parts of Heartlake City.
- Her birthday is April 10.