I got cut off before I got to talk about Steve! My stupid wi-fi I'm stealing is acting up.
Steve is probably going to vaguely recognize the HP character names (I imagine he's either seen the movies or read the books by now...they had to be in his notebook) but won't be super familiar with them, but he'll be polite to everyone. I honestly think the only character he won't be polite to at all is Ward. He'll willingly give everyone else he doesn't already know a chance.