The name of the actress is Linda Denise Blair. The name of the character she portrayed in the Exorcist is Regan Teresa MacNeil
if you are talking about the one that pops-up it's the excorsist girl.
Her name was Dana Plato.
the excorsim
the excorsim bit
The actresses name is Kristen Stewart
kelly
china
Her name is Annie Walker and she is played by Piper Perabo
The main character's name is Sophie, played by Amanda Seyfreid and her mom's name is Donna, played by Meryl Streep.
That would be Chloe Grace Moretz who played as Mindy Macready / Hit-Girl .
Tori Osceola
Mitchie (played by Demi Lovato)