Jessica is a young, beautiful, tall woman with blond hair and dark green eyes. As a Head Chef that works in a Marine base, she wears a typical Marine cook kitchen outfit along with a cook hat.
She was kind towards Sanji and Luffy, although she did not know that they were in fact part of the Straw Hat Pirates. As a Head Chef, she earned the respect of the other cooks that work with her. She gets angry whenever the other chefs are off task and holds her job in high regard and expects her subordinate cooks to do the same, scolding those wasting time or slacking off. She is bossy and loves her job and her husband.
She captivated Sanji when he disguised himself as a Marinecook, but he taught her a valuable lesson apart from cooking from the heart; that a good cook should never waste food just to use the best ingredients.
At the end, the Straw Hat Pirates escaped G-8, and she was surprised that they had escaped. Jonathan told her that his goal was to have G-8 working together, and thanks to the Straw Hat Pirates, it worked. She punched Shepherd when he threatened to shut down G-8.