Alicia - Ade will keep in store some snark just for her. Promise. ♥
Kensi - Ade appreciates ambition, being a slytherin and all. He'll probably tease her a bit about marketing schemes, but he'd definitely be friendly.
Lia - um ... she sounds so adorable. I ♥ her. lol. Ade wasn't at school as the same time as Tori but he would have definitely sent her weekly presents (including stuffed teddies) so she could have definitely saw the adorable side. I don't know. Just the image of Ade carrying a teddy bear makes me coo. lol. Given her quiet nature, Ade would probably have been protective of her in school. lol. He wouldn't even be able to help it.
Lavender - he's not entirely impressed that she's so happy or that she's a gryffindor, but she is a woman and he wouldn't be rude to her ... unless she did something to ignite his temper, which is rather hard to do. So he might lightly flirt back.
Malcolm - Ade wouldn't be able to name a Hufflepuff from his year, but he'd probably recognize the face, particularly from quidditch. i don't really see them having too much face to face interactions but you never know.