Ma and Pa Kent- Kevin Costner (actor who played Robin Hood) and Diane Lane are the home skillet, conservative foster parents of Superman. They teach him homespun knowledge, while making sure he gets a proper education. The love they show Clark is so pure and supportive, but still a bit afraid of his super powers. I liked the contrast between Jor-El's wisdom of Superman's divinity and Pa Kent's wisdom of Clark's humanity. They get a B +

Clark Kent- He doesn't exist in this movie. Who we do get is an emo Chris Hemsworth who becomes Superman. This deserves an Incomplete

Jor-El- When you have Russel Crowe (actor who played Robin Hood) in your movie then you probably shouldn't give him the guy who dies in the first ten minutes. Even when he dies in the first ten minutes he is given almost more screen time than Kevin Costner (who dies in the next twenty minutes). The solemn, wisdom prophet of Krypton is well portrayed. His purpose was more to explain the back plot to those who needed some interpretation between the galactic ramming scenes (AKA fight scenes). Jor-El gets a B + for stilling being in the movie after he died.
Perry White- I get it DC. You need a man of color to even out the all white staff. Who better than Laurence Fishburne, a man who has never been the star of any movie. There was a homeless man outside of the theater that looked more like Perry from the comics. He gets a C +
Zod- I keep wondering why I liked this movie. It's probably because Superman finally got a universe sized bad guy who had the power to mess up the world. Zod was flavorfully crazy and irrationally upset, which added color to the very quiet and stiff Superman. His plan was to destroy everyone on Earth so that Kryptonians would not have to painfully adapt to Earth's sun (a process that takes maybe 5 minutes of slight pain). Zach Snyder is a genius when it comes to brooding and gloomy atmospheres and the movie would not have made sense if Zod was not there to fill that gloominess. Zod gets an A+