Niagara paints with acrylic on canvas. With her use of bright colors, caricature portrayal of figures, and comic strip inclusion of words spoken by the figures, Niagara's style can loosely be described as Pop Art. The cartoon and comic panel style was famously utilized by painter Roy Lichtenstein, also a touchstone for her work. Her early 1970s work with collage, Xerox prints, and promotional materials for Destroy All Monsters influenced her later painting style; the bold, figurative images are evidence of that. The "lowbrow" aesthetic epitomized by the painter Robert Williams, which evolved in Southern California in the 1970s, also influenced her.