"I don't base any character on a real person, and really don't do composites either. I make them up"

Nora Roberts is emphasizing that her characters are entirely fictional. She does not draw motivation from real individuals or integrate attributes of numerous individuals to produce her characters. Instead, she produces them from her own creativity. This is a testimony to her imagination and skill as an author. She has the ability to create characters that are believable and relatable, although they are completely fictional. It also speaks with her dedication to her craft, as she puts in the effort to create her own characters rather than depending on genuine people for motivation. This quote reveals that Nora Roberts is a gifted and devoted writer who is able to produce characters that readers can get in touch with.