hhertzof and I have been debating in circles around this question for at least half an hour now; we both have opinions on it and perfectly good arguments for 'em, so I am solving this sensibly by making a poll. (I will still probably go with my answer, because it's my damn story, but I can see arguments for the other three Houses well enough to wonder what other people think.)
He was a colorless shrimp of a child, very restless and mischievous, and always much too sharp for his age...He had the devil's own pluck, too: the intelligent sort of pluck that sees the risk before it takes it. He suffered badly from nightmares as a child. To his father's consternation he grew up with a passion for books and music.
His early school-days were not happy. He was a fastidious child, and I suppose it was natural that his school-fellows should call him 'Flimsy' and treat him as a kind of comic turn. And he might, in sheer self-protection, have accepted the position and degenerated into a mere licensed buffoon, if some games-master at Eton had not discovered that he was a brilliant natural cricketer. . . . By the time he reached the Sixth Form, Peter had contrived to become the fashion-- athlete, scholar, arbiter elegantarum-- nec pluribus empar.
Poll is this what being thirteen was like for the rest of you? ETA: because there are now people in the comments who don't know me and apparently have not (yet?) read my fic in this crossover. For the record: I've already posted stories establishing St. George in Gryffindor and Hilary Thorpe in Ravenclaw. (And brief mentions of Cattermole and Pomfret in Slytherin and Hufflepuff-- and Winifred in Ravenclaw, but basically everything I write about Winifred I just make up out of thin air anyway.) I've been assuming Harriet is Ravenclaw, Honoria and Parker in Hufflepuff, Bunter (when I figure out where he fits in) Slytherin, and Mary in Gryffindor, but I haven't explicitly said so yet so y'all are welcome to convince me otherwise.
I AM HAVING SO MUCH FUN, YOU GUYS.