Because someone at Riot clearly is
Hufflepuff Ahri, Ravenclaw Darius, Slytherin Ekko, and Gryfindor Vladimir. Those colours. They just scream Harry Potter to me. Couple changes I would suggest is to make Ahri abit more yellow than orange. Maybe do her shirt yellowish?
But ya, who at Riot is the Harry Potter fan that suggested this?
But why not Gryffindor 
, Slytherin 
, Ravenclaw 
, or Hufflepuff 
?
(Schoolgirl Vel has to happen one way or another)
Omg love i hope they did them as Hogwarts Theme not academy :(and ya Ahri kinda needs a Yellow tales skin this orange one remind me of foxfire :c
I'M SO IN LOVE WITH EKKO SLYTHERINS RULE OK. *coughs oh excuse me that was loud wasn't it. :/ XD
was 
high when he assigned the houses? lol Gyrfindor Vladimir
Well, Vladimir certainly reminds me of Harry Potter, but the rest seem to be alluding to Korean school clothing and maybe anime?
Darius is totally Gamagori though, haha.
Vladimir is more of a teacher, seriously Garen should be the Gryffindor.
Hahahhahahahhaha i find this funny :3
I just noticed that. . .Lol. And someone suggested a Harry Potter style Lulu as well. Lol.
darius looks more like john travolta in grease tbh
