Berserk Button: She has one regarding the stealing of her mother's things. At first she's terrified of Coron, one of the game's reawakened dead, but the moment she realizes Coron has stolen her mother's perfume, all of Aya's fear for her instantly disappears and she jumps at her to reclaim it.
Troubling Unchildlike Behavior: Upon picking up a chainsaw, her first reaction is happy nostalgia. Also, she's oddly unbothered by the large number of dead animals hidden in the house, or with setting a giant monster on fire, or with her father's line of work in general.
What the Hell, Hero?: Ogre questions how she can justify trying to save her father after all the pain and misery he's caused.
Creepy Child: His diary entries strongly suggest he was this. He even started killing animals and eventually moved onto killing people, starting with his mother. Seeing her dead beautiful face was the reason why he started turning people into dolls.
Mama Bear: Upon discovering her husband's plans to turn their own daughter into a doll, she calls him out on his insanity and declares that she's running away and taking Aya with her. Even in death, she still seeks to protect her daughter from her husband's plans.
I Owe You My Life: Maria's devotion to the Doctor stems from the fact that he took her in off the streets when she was starving to death. Of course, he was really planning to use her as a test subject and only changed his mind when she proved useful as an assistant.
Karma Houdini: In the good ending, she gets to live and go on helping Aya walk in her father's footsteps with no real punishment for helping him, and now her, in their evil quests.
Knife Nut: She has an apptitude for throwing them.
Eye Scream: He lost one of his eyes to Aya's father.
Innocently Insensitive: The first time Aya meets him, he scares her off because he fails to realize that the sight of someone missing an eye might frighten a normal person. The next time he runs into Aya, he has his eye bandaged.
One of the mad father's test subjects. She always approaches Aya with a strange, unsettling smile on her face.
Came Back Wrong: A possible explanation for her creepy behaviour. Either that or she was driven mad by the Doctor's experiments before she died.