I've seen this on a site and thought it would work well here too. It starts off with all the characters' names. They all start with 20 points. You can take away points from one person to give to another. Here's an example.

Ron 20
Harry 20

If you like Ron more than Harry then you would rely under it

Ron 21
Harry 19

It goes on like that only one character is left. This is for the purpose to find out the best character in Harry Potter, I'll start to get it going.

Harry 20
Ron 20
Hermione 20
Luna 20
Neville 20
Fred and George 20
Lupin 20
Tonks 20
Seamus 20
Dean 20