Not much is known about Darcy, except that she's Lisa's new friend, and that she has a cat.
Darcy is essentially the opposite of Lisa. She is sweet, kind, fun-loving, energetic, and always acts her age. She also has a strong sense of humor, finding Lisa's use of large words (such as "formaldehyde") amusing. Though initially unaware that Lisa was taking advantage of her, she genuinely comes to see her as a friend, and was heartbroken when Lisa abruptly ended their friendship. However, she is shown to be generous, forgiving, and compassionate, as she gave Lisa a cookie when she noticed Lisa was feeling down, which led to them being friends again. She is also sympathetic to Lisa so she can get her grade A back on social skills on Lisa's report card again.
Darcy is a little dark-skinned girl, with long, dark brown hair, and three pairs of eyelashes. She wears a sleeveless cyan shirt with a pink flower, yellowish shorts, pink socks, and white LED light up shoes. She has a pink band aid on her right leg, which shows that she has a small wound.