I'm sorting more characters into Hogwarts houses

Once Upon a Time
Emma: Slytherin
Henry: Hufflepuff
Regina: Slytherin
Snow White: Slytherin
Prince Charming: Gryffindor
Rumplstilstkin: Slytherin
Hook: Slytherin
Zelena (Wicked Witch): Slytherin
Neal (Bealfire): Gryffindor
Belle: Ravenclaw

Httyd
Hiccup: Hufflepuff
Astrid: Slytherin
Snotlout: Gryffindor
Ruffnut: Gryffindor
Tuffnut: Gryffindor
Fishlegs: Ravenclaw

Percy Jackson
Percy: Hufflepuff
Annabeth: Slytherin
Grover: Hufflepuff
Luke: Slytherin
Nico: Slytherin
Piper: Slytherin
Jason: Gryffindor
Leo: Ravenclaw
Frank: Hufflepuff
Hazel: Hufflepuff
Will: Hufflepuff
Lester (Apollo): Gryffindor
Meg: Slytherin
Reyna: Slytherin
Thalia: Slytherin
Magnus: Gryffindor
Alex: Slytherin

Avengers
Tony: Ravenclaw
Steve: Gryffindor
Natasha: Slytherin
Clint: Slytherin
Bruce: Ravenclaw
Thor: Gryffindor
Peter P: Hufflepuff
Wanda: Slytherin
Vision: Gryffindor
Bucky: Slytherin
Scott: Gryffindor
T'challa: Ravenclaw
Carol: Gryffindor
Fury: Slytherin
Loki: Slytherin

Arrowverse
Oliver: Slytherin
Sara: Slytherin
Barry: Gryffindor
Caitlin: Ravenclaw/ Slytherin (Frost)
Cisco: Ravenclaw
Kara: Gryffindor
John: Slytherin
Alex: Gryffindor
Lena: Slytherin
Mick: Hufflepuff
Ray: Ravenclaw
Nate: Ravenclaw
Ava: Gryffindor
Gary: Hufflepuff
Mona: Ravenclaw
Charlie: Slytherin
Amya: Gryffindor
Snart: Slytherin

Am I Slytherin bias? Yeah, maybe, but remember this is all my own opinion