The third character from the free game Ib. Originally unplayable, the update for version 1.4 of the game included a small part where the story is told from her perspective.
Mary is a blonde girl with blue eyes, wearing a green dress. Often depicted with a paint knife.
She is the final and main antagonist, Mary is actually a painting that came to life. She'll try to kill Garry and Ib in order to take their place.
One of the endings shows that she has taken the place of Garry and lived with Ib.
While another one makes the player play as her in the final stretch of the ending.