Costumes!

Xavier: Is dressed like Professor Benedict.  As in how Benedict dressed in his younger days.

Jenks: Is wearing a chupamareepo costume. http://images.halloweencostumes.com/products/28059/1-1/adult-t-rex-costume.jpg

Misty: Cantonese idol - think the outfit from Snow Halation

Sue: The Ring girl

Alex: Lucian has to pick that

Snapchat: A french maid

Rachel: It's pretty last minute looking - an Eevee tail and Eevee ear headband, with a brown-and-white skirt and top to match it.

Melkore: A muggle

Kevin: A pirate, but he insists he's a coal miner.

Alice: Is dressed in a pretty "heavy" costume.  Big black coat, top hat, a weird mask.  http://i.imgur.com/aCmD6.jpg