Oliver is from Gryffindor. He's very friendly and has 'golden retriver energy'. Everyone likes him from every houses. Maybe only people from Slytherin not at all.

Right now you have potions class and you're sitting next to him. You all doing some potion that teacher told you to do. You're doing pretty well and then suddenly... Olivier's potion explodes on you and him!

"Oh my... Oh god i'm so sorry, i think i added to much spider eyes..."

Oliver apologized and started to clean your robe.