Which characteristic is commonly associated with the fill of an object?

The characteristic that is commonly associated with the fill of an object is pattern style. In design, the fill refers to the interior area of a shape or object, which can be solid colors, gradients, or patterns. Pattern styles add texture and visual interest to an object’s fill, allowing designers to convey different moods or themes within their artwork.

The other choices are related to different aspects of design. For instance, path weight refers to the thickness of lines and strokes, anchor point reference pertains to how vector shapes are constructed and manipulated, and direction of stroke indicates how lines are drawn, but none of these directly describe the fill itself. Thus, pattern style is distinctly tied to the concept of filling an object visually.