Ares Trembley is in Ravenclaw, but she trusts this will not present an obstacle.

Oh, hardly. He finds Karen at dinner the next day to ask after Ares.

"Yeah, he's one of the new boys. Got into a row with Corner."

"Over?"

"Uh, Trembley said something about people who marry Muggles and Corner punched him - Potter broke it up - then something happened in their broom lesson and Trembley got locked out of their room all night, I saw him asleep in an armchair on my way to breakfast but he snapped at me when I asked what happened."

"Thank you." And the next time he runs across Trembley - which is quite soon, funny coincidence - he waves him over and says "want to restock potions supplies with me and earn your house sixty points, I'm in a hurry" -

"- sixty - okay -"

"Fair warning there are lots of them and they're smelly if they spill." Stocking cupboard. "Trembley, right?"

"Yeah. Um - Way?" He is guessing significantly based on how many Ways there are.

"Always the safest guess. And yes. I'm Minor and Aaron's brother." He hands him vials. 

"I don't think I've actually met them." He figures out where things go and puts them.

"They spend a lot of time haring off after one project or another. I suppose maybe everyone in Ravenclaw does that." There are lots of things to put; he picked a task that'd take a full hour.

"I guess."

"Not your style?"

"I haven't thought of anything yet."

"I think Aaron's first year the thing he was mostly haring off for was ways to alternately annoy and impress his roommates."

Nod.

"Were you hoping for somewhere else?"

"I thought Slytherin like my siblings but the hat didn't even consider it."

"I wanted Hufflepuff."

"It considered Hufflepuff."

"Ministers of Magic are more likely to be Hufflepuff and I wanted to be Minister of Magic. And also people are less suspicious of you when you're not in Slytherin. I suppose those were pretty Slytherin reasons to want Hufflepuff. Do you wish it'd let you pick?"

"I dunno if I'd like Hufflepuff better but it wouldn't have Corner in it."

"What'd he do?"

Contemptuously: "Duels like a Muggle."