Nimona is playful, violent, happy to commit crimes, and willing to do whatever it takes to accomplish her goals, such as physical assault, kidnap, and murder. She likes messing with people. She can also be inconsiderate of others, particularly when they're stressed. She's a bit of a loner due to being ostracized by the kingdom as a monster. She can also be quite kind and caring, and tries to help children in particular, which makes their fear and hatred of her harder to bear.