Her hostility to the scientists also extends to any workers that are affiliated with Playtime Co. In the Transfer Request Document, Mommy was revealed to be hostile towards the scientists and personnel of Playtime Co. Near the end of the game, she even doubled the panels and ramped up the speed of which the correct orders are displayed to make it impossible to win. For example, the Musical Memory game originally only had four colors, but Mommy Long Legs tampered with the mechanics so the program adds more colors and even mathematical properties to the game to increase the difficulty. Mommy Long Legs however does everything in her power to prevent the player from winning and killing them in the end, such as rigging the games which the player is forced to participate in. Throughout the events of Chapter 2, Mommy Long Legs ropes the player into participating multiple games, in which she claimed that she will hand pieces of the train code if they win the games.

She tends to mask her frustrations with a friendly childlike facade to hide her growing anger, such as when the player wins yet another game of hers, or when the player escaped from the Statues game area, causing Mommy to desperately try luring the player back into the game area with the false promise of giving them the train code, while increasingly getting furious and violent. Throughout the variety of games the player has to play in to win and survive, Mommy Long Legs displays a sinister mix of childlike friendliness and mentally unhinged, making her movements unpredictable. This facade, however, diminished very quickly as she threatened The Player with death and the possibility of having their innards consumed by her, should they refuse to abide by her commands. In the beginning of Chapter 2, Mommy Long Legs presented herself with a warm and welcoming front to lure The Player into participating her games. This confirms that she is organic in nature like Huggy Wuggy and other living toy experiments.

During her death scene, blood can be seen splattering out of Mommy Long Legs as she is crushed by the grinder. Her body is also twisted in even more alarming and unnatural angles throughout her final chase. Her hands are enlarged maniacally, and her fingers are splayed and elongated to resemble claws. Her hair is now twisted and mangled, no longer the neat curls in her previous two forms. Her irises have also faded to a pale artichoke color. However, her eyes are now completely dilated, giving off an unhinged vibe. In her deranged form, Mommy's general appearance remains almost identical to her furious state. Her face is twisted into a permanent frown, while her mouth has become a scowling grimace.

Her entire body becomes withered and covered in grime. In her furious form, Mommy takes on a deranged and annoyed appearance. Her arms end in two crimson glove-like hands with thin baby blue cuffs, while her legs end in ankle-length baby blue stockings with crimson Mary Janes. Her four limbs are all extremely elastic, capable of stretching 'hundreds of feet' according to the Transfer Request. A thin neck with a baby blue necklace connects her head to her body, which is comprised of a small angular torso with a dark pink sweetheart neckline, a thin appendage resembling her 'waist', and a rotund dark pink bottom to resemble a sweetheart-bodice dress. Dark pink lipstick can be seen adorning her mouth, and she has no nose. Her face consists of a pair of wide-set green eyes with tiny pupils, black eyelids, and three eyelashes, as well as a gaping, hollow mouth. She has baby pink skin with curly, tangled noodle-like hot pink hair, styled into a high ponytail using a baby blue hair tie. Mommy Long Legs is a large, slender creature bearing an uncanny resemblance to a spider, albeit with only four limbs.

Poppy playtime costume