Elizabeth Swan, or Betty seeing as she didn't want to be a character from a pirate movie, is a semi-regular 14-year-old freshman. The girl now has to deal with moving to a new school and dealing with her dramatic spazz of an older half-sister and all the crap that comes with her. And she wouldn't see herself as the comic relief in the drama, more like the common sense.
Amaryllis Evans is too obsessed with a greasy haired Slytherin, who's obsessed with her twin, to realize that her own dog with a shining fur coat is falling for her.