The amino radical has two characteristic electronic states:
The more stable electronic state is B, where the unpaired electron is in the p-orbital perpendicular to the plane of the molecule (π type radical). The high energy electronic state, A, has the two electrons in the p-orbital and the unpaired electron in the sp orbital (σ type radical).
Nitrogen centered compounds, such as amines, are nucleophilic in nature. This character is also seen in amino radicals, which can be considered to be nucleophilic species.