Taken from the Google Docs, this list is a running musing of who some of the people we've met are on Pretty Little Liars.
WHO ARE THESE PEOPLE
-The Woman in Black at Wilden’s funeral?
--Seen in an ‘A Scene’ taking off an Ali mask of which one side is burned, presumably from the lodge fire
-The Creepy Zombie from ‘The First Secret
--Accounted for: Melissa, Ian, Noel, Jenna, Wilden, Liars, Sort of Accounted For: Mona, Lucas
-The Girl in Ali’s Grave
--Bethany Young
-Board Shorts
--Is this 100% Ezra?
--Is this the same person as Beach Hottie?
http://www.wetpaint.com/pretty-little-liars/articles/2013-12-13-spoilers-beach-hottie-board-shorts-same-person
-Beach Hottie
--Same as Board Shorts?
-The “guy Alis likes who likes to make movies”
--Ian? Board Shorts/Ezra?
-The person driving the car when Ali is hurrying to Route 30 from the mask guy’s workshop
-The person Ali thought she was afraid of
-The person who Ali comes to realize she should be afraid of
-The person who is A before Ali disappears
-Dr. Sullivan’s son
-The body in the woods Spencer thought was Toby