Based on the provided responses, it seems that the polygons you are referring to are all trapezoids. Trapezoids (or trapeziums in some regions) are defined as quadrilaterals that have at least one pair of parallel sides. Therefore, the most fitting common characteristic for all the polygons mentioned (assuming they display traits of trapezoids) is:
Each appears to be a trapezoid.
This is correct as it aligns with the definition of trapezoids having one or more pairs of parallel sides.