Ok! Insane ideas ahead! Since you don't want to limit your characters I decided to suggest something crazy I mean it's Halloween cosplay after all
Mulan as Lara Croft
Ariel as Marvel Girl or Phoenix (Jean Grey from Marvel comics). Since you already have Wonder Snow I thought that it was time for Marvel
Belle as Bayonetta! Too hardcore? Give it a try
Giselle as Angela insidepulse.com/wp-content/upl… I know that she's practically naked but it was first that came to my mind
Tiana would look good as Ertha Kitt's Catwoman (sexy and stylish)!
Merida as Buffy!
Cinderella as Beatrix Kiddo!
Aurora as Trish from Devil May Cry
Jasmine as Azula *__________* Jasmine the Princess of Lightning and fire.
They don't make any sense I know but people who cosplay don't always look like the characters they cosplay