Mary is the main antagonist in the game Ib and the second person to join Ib's party. Even though Mary seems like an ordinary human, she is actually the last painting that Guertena ever worked on. Her goal is to exit the cursed gallery of the Fabricated World to the real world in order to make a new life for herself and make many friends, but her dream can be reached only if she manages to sacrifice the life of someone from the real gallery before jumping through the Fabricated World painting.
Mary's depicted age is unknown; however, she appears to be around the same age as Ib.
Ib and Garry meet Mary in the Violet Area. The reason as to why she tries to take Garry away from Ib in order to be closer to her can be interpreted as the effect of her jealousy towards Ib and Garry's strong bond. It can also be noted that she tries to make Ib like her better. When she asks Ib questions about Garry after reaching the Violet Area, it becomes obvious how interested Mary is in the subject of how much Ib cares about Garry. When Garry finds out that she is a painting, the Strained Ear painting listens in on Garry's exclamations of this shocking discovery, which instigates the Tattletale painting to whisper this news to Mary. Upon hearing about the discovery, Mary will stand still and not move, causing Ib to worry about her. Also, Mary attempts to get Ib's attention by walking around the room and talking to her about everything she knows about the real world. After Ib uses the plastic key to unlock a door, Mary will brandish her palette knife.
Note that if Garry fails to escape the Doll Room, Mary will tell Ib that the Garry she is with may not be the real Garry in an attempt to trick her into leaving him. She becomes jealous of how Garry gets all of Ib's attention (i.e., In the Doll Room, where Ib hugs Garry after frantically trying to snap him out of a trance), and starts to say very strange things, and even goes as far as to repeatedly stabbing a mannequin head to vent her anger towards Garry. Eventually Garry finds out that Mary is not a real person, as she is actually Guertena's last work before he died and that Mary came to life, much like Guertena's other artworks in the cursed gallery.
Mary gets tackled by Garry in the Brown Area after the events of the Doll Room. If Garry escapes the Doll Room, then after Mary begins to act erratically, causing Ib to leave her behind Mary catches up with her and corners her, Garry appears and tackles her before she can harm Ib. If Garry does not escape the Doll Room, then after Ib and Mary find him and bring him back to reality. Mary drops her rose as they are leaving the Brown Area. Garry picks up her rose, causing Mary to panic and attack Gary with her palette knife. Garry overpowers her, knocking her out and remembering her true nature.
Mary appears later in the Sketchbook, in the house where Ib and Garry find the bucket, after they collect the bucket, Mary appears as they prepare to leave, but she doesn't search the house, allowing Ib and Garry to continue unharmed.
Mary can appear again in the Toy Box. If Ib is unable to find her rose, it is because Mary has taken it. Garry trades his rose for Ib, after which Mary runs off. She plucks the petals of the rose, killing Garry. Either way, she will appear if Ib (and Garry if he is still alive) finds the room her painting is. She demands that they leave immediately, then draws her palette knife and attacks them. If Ib is unable to reach the painting and burn it before Mary catches them, Mary kills them. However, if Ib reaches the painting and burns it, Mary turns to ash and dies soon afterwards.
Mary plays an integral role in the endings of the game, and her actions may vary depending on Ib's choices throughout the game-play.
The endings that Mary mainly plays a role in includes A Painting's Demise or Welcome to the World of Guertena, endings which are bad and good for her, respectively, but are not good for Ib and Garry; Together, Forever is Mary's best ending.
