Nicole greatly resembles her oldest son, Gumball, who is, like her, a cat. She has light blue fur, and is somewhere between Richard and Gumball in height. Her head is shaped similarly to Gumball's, except Nicole's whiskers are shorter than her son's, and she has visible eyelashes. The inside of her mouth is light pink and her tongue is pink, and her nose is pink. In Season 3, Nicole's eyes are permanently round along with the rest of her family.