Irene just so happens to be Guido's next door neighbor! Hope she enjoys Taylor Swift.
Jean seems like someone Guido would try and understand, feeling that different sides of personality thing all too well. He also loves cookies on doorsteps despite his calorie count. She's good people to Guido. =)
Allison, Tabitha, Kitty and Laurie are more than welcome to ruin/help/star in drama class this upcoming semester! It's going to be a musical, so Alison's got a lock on a good part if she so desires? Laurie might actually be able to give Guido some advice once he finds out he has nifty healing blood down the road...
Selene, Anna Marie, Wanda seem mad, bad and dangerous to know (in any order you choose!). If Anna Marie wanted to have taken drama from Guido, I can put a finer point on when he started working at the school; otherwise, he's that big feathery listener that doesn't judge and secretly understands feelings more than burpies (it's a workout thing!).
Whew! Anything I missed? =D You have super cool characters and I want to make sure I get them down right.