I understand your perspective! Characters are indeed essential in storytelling, and in this instance, Jason and his impatient friend are central to the scene. However, if we are focusing on which element is most prominent based on the description you provided, the setting (the bus stop shelter during the rain) is highlighted, as it creates an immediate context that influences the characters' actions and interactions.
That said, if the focus of the analysis is more on the characters' behaviors and their relationship (with Jason taking cover and his friend urging him to continue), then character could also be seen as prominent. It's a nuanced distinction, and both setting and character can be considered important based on how you interpret the scenario.