After the summoning of the Dark Purveyors, Mariska is the first to speak, expressing her personal disgust to be in the presence of Earth. As she and the other Dark Purveyors are ordered to separate and "rot" San Romero, she primarily resided in O'Bannon Farm as her targeted area. Unlike the previous Dark Purveyors, Mariska does not directly confront nor challenge Juliet until the end of the level when a boss fight with her is initiated. Instead, she leads her and Nick through a maze of psychedelic trips, causing much confusion.
Mariska is first encountered in Psychedelia after Juliet defeats Chat the giant chicken. When searching for Rosalind, a pair of arms grab Juliet by the shoulders and push her aside. This causes curiosity and cautious confusion to Juliet. Mariska then turns the keys of the bus, and Juliet will have escaped Psychedelia and somehow managed to land on a tractor. After a similar event reoccurs, Mariska re-summons Juliet, only to have introduced to three more giant chickens and three mechanical ones. Juliet then finds herself on a tractor once again.
When Juliet goes on to continue her search for Rosalind, she finds Mariska disguised as her sister, riding the bus and encouraging her to enter. As the two begin a conversation, Juliet grows suspicious as Mariska claims that she managed to fix the bus, unaware that Rosalind has little knowledge about transportation vehicles. As Juliet's suspicions grows, Mariska finally reveals her identity just before they enter Psychedelia once more.
Unlike her fellow Purveyors, Mariska acts oddly welcoming towards Juliet and Nick despite having knowledge of Juliet's heroic intentions. Her goals are also somewhat different in comparison to the other Purveyors, appearing to be tied up in achieving a large collective unconsciousness, as opposed to direct mayhem and death that is brought upon by the other Purveyors. Juliet, not having any of the zombie's civil talk, insults Mariska about the foul stench emanating from her. A provoked Mariska then reveals to Juliet that she has somehow put Rosalind under her influence, showing that she is trapped in a bubble. Thus begins the boss fight.
Mariska begins to battle Juliet in a subtle, seemingly harmless way. Her primary attacks are the use of her Psychedelic Bubbles that appear in several pairs to trap and immobilize their victims. A sawing of her midsection reveals Mariska's ability to duplicate herself, with a dismembered half regenerating in order to continue the battle. Juliet eventually manages to escape Psychedelia when Mariska's right collarbone is slit, leaving her vulnerable. Mariska gives a peaceful goodbye before Juliet decapitates her, destroying her sitar in the process.
Mariska's outfit is heavily influenced by the hippie sub-culture, as most of her attire prominently retains to it. She wears a red colored head band with an oblique design and a silver three-leaf clover piece in front with a long-beaded necklace. Her clothes include slightly torn, bell-bottom jeans with flowers design on her right leg, an off-shoulder, yellow belly top dashiki with a faded psychedelia design and reddish birkenstock boots. She sports her look with make up, such as teal/light green lipstick and multi-colored nail polish.
Her skin is an unusual pale green, and appears to be at a stage where she is rotting, as Juliet and Nick comment about a stench that appears to be sourced from her. Her necrosis can easily be seen within her stitches that go around her forehead, neck, front lining of her abdomen, waist, hands and shoulders. The necrosis also appears to have deteriorated her navel and parts of her chest.
Mariska is shown to be the least violent of the Dark Purveyors. She seems calm and peaceful, but also a bit deviant. Like the hippie stereotype, she appears to be high most of the time, as she acts dazed and absent during her confrontation with Juliet. She may also be considered the most mystical of the Dark Purveyors, noting her peculiar abilities.
Illusions: Mariska has the ability to conjure or influence others into a state of illusion. This includes her abilities to manipulate other people's minds, send them into another dimension that may be their inner subconscience, impersonating others, or confusing and teleporting others to locations that they have previously encountered.
Levitation: Mariska always appears to be able to levitate, even when she is weakened.
Teleportation: Mariska will often teleport herself to other locations in order to avoid upcoming or occuring attacks.
Psychic Bubble: Mariska will often encase herself within the barrier of a bubble. The bubble doesn't appear to be the cause of her levitation ability, but its presence may be for the purpose of protecting herself from attacks, in order to receive less damage.
Telekinesis: Mariska is capable of levitating others. Her Bubble Blasts are what primarily do this, but she also has another attack that cause Juliet float. Mariska will perform a sedative dance if the player has failed to hit her with a finishing strike; it lifts Juliet into the air and them slams her to the ground, causing a spark of light to appear off of her. It is unknown whether she has this ability or whether it is the result of her induced illusions.
Replication: Mariska is highly noted for her ability to replicate herself into multiple others through a seperation of her body. Once seperated, her halves will regenerate. She will then continue to multiply herself by tearing herself apart. She has only been known to split into eight.
Bubble Blasts: Mariska is capable of creating bubbles that do not necessarily bring real harm to Juliet, but trap her when caught and decrease her health.
Mecha-Chicken-Zilla:As seen earlier within the level, Mariska can summon a chicken head attached to a thin mechanical support that allows the chicken to elongate its neck and peck at Juliet. Mariska is always seen riding the chicken when displaying this attack.
Need a Hand?: Mariska creates a large version of her hand that rises out of a pit. It slowly lands itself unto the platform and starts crawling after Juliet. If it catches up, it will slam itself onto her.
Pretty Gritty Butterflies: Mariska creates prism-colored butterflies that attach themselves onto Juliet. They eat away at her health and slow her down.
Rocket's Red Glare: Mariska summons a rocket ship that emits flames and target itself towards Juliet. It starts spinning and won't stop until Juliet is either harmed or a period of time has past.
Lack of Aggression: Mariska has been shown to be the least violent out of all of the Purveyors. Because of this, she transitions attacks that do not cause severe danger unless she is persistently provoked.
Open Environment: The environment in which Mariska's boss fight takes place leaves her wide open and vulnerable to attacks.
Right Collarbone/Arm: Mariska appears to be completely weakened whenever she recieves damage from areas that affect the right side of her body. It can be presumed that this weakens her powers entirely, because she can no longer attack with the use of her sitar.
Mariska appears to symbolize Swan's innermost passionate feelings he has towards Juliet. This can be seen in Mariska's non-aggressive behavior towards her enemies and how her devious intentions aren't openly malevolent. The fact that she is the least violent Purveyor may symbolize an implication that a part of Swan actually still cares for Juliet, or that Mariska is what is left of Swan's kindness.
She bears a striking resemblance to Riruka Himezono, Reiko's psychotic twin sister and main antagonist of the horror manga series Reiko the Zombie Shop. Also, Riruka becomes a zombie (albeit the zombie servant of fellow necromancer Chikuro) after being killed and taken to Hell in the seventh volume of the manga.
She also vaguely resembles Marceline from Adventure Time. Aside from both of them being undead tricksters and having black hair, Marceline plays a bass and Mariska a sitar.
Mariska's mismatched eye colors appear to reference Paula, a character that appeared in the video game Shadows of the Damned, another video game made by Suda51. Both characters have a left yellow eye and a blue on their right.
Her right eye is damaged, making it a translucent blue and the iris blurry.
Her aura/energy color is green.
She is the least violent Dark Purveyor.
Her name means "bitter" in Hebrew.
She is never seen standing up, with the exception of concept and render artwork. According to said render work, she is taller than Juliet and shorter than Zed.
In the concept art, it shows that Mariska was originally going to have frizzy hair, sagging breasts, elongated veils on her sleeves, less prominent stitches and a face that looks much younger than the one seen in the game. It can be presumed that these changes were made to contrast her from Juliet.
Her data files refer to her as "Nicola", suggesting that this was initially going to be her name before it was changed it to "Mariska". Examples: "TX_CH_Boss_Nicola_Skin_D", "TX_CH_Boss_Nicola_Cloth_M", etc.
There is a possibility that the Rosalind that is presented to Juliet before the boss fight with Mariska may actually be an illusion, as Rosalind is later absent during the battle and is suddenly in the grasps of Josey.