If you had mostly A's you are…
Remus Lupin
To the outside world Remus is a nice, quiet, studious boy that should have been put in Ravenclaw for all the time he spends in the library on his homework. What they don't know is that he's looking up spells to jinx the Slytherins with! Remus is just as devious as the rest but someone has to look innocent. He is the planner, using his logical thinking to keep the rest out of trouble. Remus is very loyal to his friends and will accept them fully if they'll do the same for him. And rest assured he'll always tell you the truth, unless you're asking about his whereabouts during the night of the full moon.
If you had mostly B's you are…
Peter Petigrew
Peter may be somewhat of an outcast among his group but they wouldn't hang out with him if he was all bad. Peter's shy and a little slow but he definitely has good aspects, I'm just not sure what they are yet!
If you had mostly C's you are…
Sirius Black
Many think of Sirius as just an outgoing troublemaker, and guess what? They're right! Though he never pays attention in class and the thought of studding doesn't once cross his mind, his test scores are always great. School is never his first priority and only uses it as a way to have fun. His favorite thing is pranking the Slytherins to get back for any mean comments they may have said, or just for entertainment. Sirius is a great person to have around if you're looking for fun but if you're looking for a study buddy I think you've got the wrong person!
If you had mostly D's you are…
James Potter
James Potter is adored by practically the whole school, not counting the Slytherins. The teachers love his ability to suck up and gift for magic. The girls love his charm and dashing good looks. All the other students love how he puts Slytherins in their place on the Quidditch field. He is usually found in between classes having a verbal spat with a Slytherin or causing trouble with the rest of his friends. He is commonly known as the leader of the infamous Marauders and in a group he likes to call the shots. James hates it when his friends fight so he'll bug them to work it out until they do. He is honest, brave and an all-around true Gryffindor!