Well here's a reminder of the SPHEW members for the benefit of all: The following is the impression I've already gotten from their personalities

From Hufflepuff:
Susan Bones - cautious, loyal, feeling they're getting into DOOM and trying to avert it.
Hannah Abbot - smaller than the rest, shy, but trying too hard sometimes in order to impress the others - and Neville

From Slytherin:
Tracey Davis - very theatrical, very very eager, getting into the Darke Lady spirit, most silly of the girls, wants Draco and Harry for her husbands
Daphne Greengrass - attempts to seem dignified and self-controlled as befits her Most Ancient House, also crushing on Neville

From Ravenclaw:
Hermione
Padma Patil - currently trying to find a non-evil way of not-falling-back-into harmony with her sister Parvati)

From Gryffindor:
Lavender Brown - most enthusiastic about the hero/superhero thing, with costumes and catchphrases and such
Parvati Patil- only one who's personality I'm not certain about.