Why not... make it a contest?
Alexis is the straw hat-wearing girl.
Aidan is the grey-haired dude.
Tranquility & Ataraxis? They're like Serenity, but with gas masks <3
Ilina is a redhead without that bang that Shinica and Serenity have. (Ilina apparently dyes her hair and is a natural brunette?)
Shiori Shauntal... that purple-haired girl, right?
Lunadine, the girl with red hair, dressed in blue IIRC; think she has a staff too?