Susan is Cinderella because I was having a hard time finding a red-headed heroine and Lari pointed out that Cinderella isn't really blonde but gingerish. So a little photoshopping later and I had a properly red-headed Cinders!
Romilda is Esmeralda because Meg was taken. :P Esmeralda still suits her, though! Esmeralda and Romilda both have dark, curly-ish hair, they're dramatic and like dancing, are fond of big earrings and dressing up... And in the end, Romilda would totally go for the handsome guy and not the ugly one who was kind to her.
Draco is Nuka because pointy blonde chartoon characters are hard to come by. Male ones are, anyway. I was so tempted to use Quicksilver from X-Men Evolution but I couldn't find enough images (and he's too tanned anyway). So yeah, Nuka it was! Because he's malicious and wants to live up to Scar's example, much like Draco wants to be like his father.