Nicole cares deeply for her family, so much that she would do anything to express her love for them. She is also very protective of her family, as seen in. Since she's the only truly responsible member of the family, Nicole does most of, if not all the household chores, and in addition, she works long hours at the Rainbow Factory just to put food on the table.

Unfortunately, Nicole also suffers from a tremendous amount of emotional stress because of her many duties. She is also quite the demanding mother, and has an extremely nasty temper that can turn her into a very scary person when upset. In fact, Gumball decides it'd be easier to face a giant T-rex than an angry Nicole. Despite her emotional stress and her nasty temper, Nicole is still kind-hearted and sweet, and has a softer side at times.

Nicole is also very athletic, and is fully capable of chasing her children across the neighborhood when they're in trouble. Gumball compared her to a ninja. She's also been shown to be competitive and strong enough to tear down a door. Nicole can be quite stern when provoked, and occasionally vindictive. On top of this, she has also proven be very resourceful and inventive, a trait she most likely passed on to her daughter Anais, who has demonstrated similar talents, in this case, strategically setting a mine-like trap in a paintballing arena/forest merely using environmental supplies and whatever she took with her. Winning seems to be a necessity for her at times, possibly indicating that she is slightly obsessive. Though, despite her somewhat ruthless faults, she is able to accept defeat, acknowledge her mistakes, and even find humor in them. When Nicole is angry, sometimes she can produce some sort of 'heat vision' from her eyes, where she melts the plastic wrap and where she completely burns Richard's Marshmallow by just looking at it since she was quite angry then.