Here you can see,which charakters are needed.

Girls:
-Spencer Hastings
-Aria Montgomery
-Hanna Marin
-Emily Fields
-Melissa Hastings
-Ella Montgomery
-Jenna marshall
-Ashley Marin
-Mona Vanderwall
-Paige McCullers
-Maya St.Germain

Boys:
-Byron Montgomery
-Ezra Fitz
-Mike Montgomery
-Toby Cavanaugh
-Noel Kahn
-Sean Ackard
-Lucas Gottesman
-Ian Thomas
-Caleb Rivers
-Wren Kim
-Ben Coogan
-Alex Santiago
-Jason DiLaurentis

And of course there's "A".Besides Free-Charakters are also allowed.

already being played by others