The Plot and Character Breakdown to my Trailer

Plot Overview:

Invitations to a party that mysteriously turn up at a school. The event then moves to Facebook and social media spreads the party around. The main character, Charlie, suspicious, yet her friends persuade her to go. The party is all going well until people begin getting attacked and split up. By the end, Charlie has been split up from her friends, with people she doesn't know, defending her life. A little party never killed nobody...

Characters

Protagonist:

Charlie

Female

18

Dark, long hair

Blue eyes

Strong Willed

Intelligent

Suspicious

Antagonist:

Potential classmate/ ex-classmate

Male 

around 16-19

In a mask, no facial features ever shown

Sinister

Silent

Monster Bait: 

Casey - Male 19 popular, sports-man, arrogant fool. 

Martha - Female 17 popular, ditzy, nervous. 

Marlon - Male 18 intelligent, uninterested with the populars, seen as cool but an outcast. 

Jake - Male 16 much younger than the others, desperate to fit in, gate crashed the party.