Name characters you hate so much that you want to "kill it with fire" type of way.
[spoiler free/don't worry]Susannah Dean. Probably require the most acting-intense, skilled actress to play the character in The Dark Tower. The actress would have to be on the level of Jack Nicholson to play the role and it definitely would be interesting to watch.
But what she did in one of the most crucial task was beyond impossible, and I'm not sure if I'll ever forgive her. I went from laughing to trembling with hatred reading the consequences of what that action leads to.
Fire her up because I'm going to cook her.
Emma Frost. Represents pretty much every stereotype of what can be hated about the most horrible of women. Dresses like a stripper, is egotistical as hell, and thinks her body is just another form of currency to get her what she wants.
Hopefully she gets mutated STDs from Toad.