The Emperor: Upright represents loyalty to structure and firm, the masculine aspect of dealing with issues directly. Upright, The Emperor represents the use of analytical thinking over emotional aspect that can be found with The Empress.Reversed, The Emperor represents disloyalty or the use of abusive language or actions of an untrustworthy individual.
I guess I can see the Emperor with Reimu dealing with each situation and incident that emerges directly. There's also the blunt and somewhat cynical attitude that she portrays that may be deemed abusive or impolite, depending on the situation.