This is le Hamilton Squad.
I'll tell you who's who by Christmas sweaters. (I'm not going to say people not on Wattpad's real names)
White Merry Christmas Sweater: Me
Red with single green stripe: Friend at school
Dark Red, Green and White with Xmas tree: BranchyPie
Red and white striped: Friend at school(if you follow Branchy you know her as Blondie)
Plain dark green: CherryBlossom_Senpai
Light gray, one red and one green stripe and a Xmas tree: McNugget_Senpai

Original lineart:

*realizes most of my friends have brown hair*
Well then...