Ron Weasley
Hermione Granger
Ginny Weasley
Fred and George Weasley
Molly Weasley
Severus Snape
Cormac McLaggen
Hogwarts's resident douchebag, Cormac McLaggen, would be all over Tinder. He'd probably use it to find his next date to a Slug Club party, because no girls he knows in real life would actually go with him. He would also try to impress the ladies with his connections...and nobody would ever respond.