Howdy! I'm Brooke, one of your two mods here. I've got three kids, all of whom are up for plotting!
First is Sara Spector, 11th grade dancer. She's from Brooklyn, she's really eccentric, but she's really fun. She's Sara from Ben Folds' "Zak and Sara". I think she would really like him! They would probably be good friends.
Next, I've got Alfie Nolan, ala Lily Allen's "Alfie". Alfie's a 12th year music major, and he's a really big stoner. He plays a lot of video games, smokes a lot of pot, flirts with a lot of girls, and is really chill and most of the other students probably think he's really cool. Alfie is also a Jersey boy, unfortunately. He'd be nice to Harper, but I'm not sure just how much interaction they'd have?
Last, I've got Darcy Delaney, based off of "Doris Day" by Jack's Mannequin. Darcy's a California girl through and through, and is only at Presley because of their great art program (she's in the 12th grade). Jersey shore beaches just don't cut it for her. She currently has a NPC boyfriend, but he's not very faithful and he's in a semi-successful punk band that's touring the country so she's pretty lonely.