In the animated series "Miraculous Ladybug," the Nuroo is a kwami associated with the power of knowledge and intelligence. Kwamis are magical beings that help their respective wielders (called heroes) enhance their abilities and harness powers that are often used to combat villains or protect the city of Paris.
While Nuroo itself is a force for good when it is aiding Ladybug and Cat Noir or any other hero, it is important to note that in the context of the show, the intentions behind the use of magical abilities provided by kwamis can vary. The moral implications can depend on the decisions of their wielders and how they choose to utilize the power they are granted.
So, in the context of the series, the powers granted by Nuroo—as with the powers of other kwamis—are indeed meant to be used for good, but the outcome relies heavily on the choices made by the person wielding that power.