I don't Know if there is already one if there is sorry. Anyway you add a + sign for a character you like and a - for the one you don't like. Each one starts off with 10 points and then you copy and paste all the characters and we go until we have a winners bracket. the characters do not have a signed point value.

I'll Start

Harry 10
Hermione 10
Ron 11+
Ginny 10
Voldemort 10
Mrs.Weasley 10
Mr.Weasley 10
Fred 10
George 10
Bill 10
Charlie 10
Percy 10
Dumbledore 10
Severus Snape 10
Luna 10
Cho Chang 10
Lavander Brown 9-
Parvati Patil 10
Padma Patil 10
Neville 10
Dean Thomas 10