Sarah Henderson/Needlem0use

In the present day, Sarah is completely consumed in her quest of vengeance. Swearing off her former friends before killing them all, Sarah's death has caused her. While somewhat excusable at first due to her death, Sarah's morals start crumbling apart the moment she starts attacking Tom and Kyle, two children who are completely unrelated to the incident at hand.

This twisted sense of justice has led Sarah to become absolutely controlling over her domain at all times, leading to her exploding in anger the second Luther starts to fight back. Her reign, lasting over a decade long, is the main cause for these newfound tendencies, due to Sarah going mad with power that she didn't have when she died. Her inability to let go of her past combined with someone

Despite it all, the people she was closest to, her family and Lily, are spared from her wrath. Unable to grapple with the idea of them moving on, the idea of the pain that they went through after her death was one of the key reasons why Sarah started her spree to begin with. The realization that Kyle was adopted by Lily in Sarah's honor only destroyed her further after killing Kyle.

While she was alive, Sarah was not exactly the greatest person, but nowhere near the monster her death had created. Within the friend group, Sarah's relationship with Michael and Martin was strained at best, with her not exactly having been the greatest to them. Her friendship with Luther, however, was much more warm and genuine, likely contributing to her decline in mental state as he was the one who dealt the killing blow to her. Her relationship with both her family and her girlfriend, Lily, was also extremely positive, with the two of them promising to be together forever before the tragedy struck.

All in all, Sarah is flawed. She knows what she is doing is too far gone, but another part of her (heavily fueled by Atem) wants her to continue her broken crusade. This conflict of interests has led to the creation of an incredibly conflicted entity, her quest for vengeance leading her down a path of self-destruction degrading her very soul. Like most Sonic.exe incarnations, Needlemouse manifests as a corrupted sprite of Sonic the Hedgehog, often in horrifyingly supernatural ways. In In-game, Needlem0use tends to appear as a variant of Sonic the Hedgehog, albeit with pale skin and purple quills that droop downwards. Somewhat lanky with a notable snout, orange gloves, vertical slits for eyes that open up to reveal deep red pupils, and a somewhat frozen grin plastered on her face that can open to reveal sharp red teeth, Needlem0use's appearance is notable enough for even the most uninformed to know that something is wrong. That being said, most of these changes are hidden away unless Sarah wants them to be present. When upset, Needlem0use's head may be covered in shadow, and her skin may turn to a bright red.

In a sort of battle mode revealed in "Atem", Needlem0use gains a red X on her chest and red markings become visible on her quills.

Sarah Henderson, when she was alive, was an Asian young adult with freckles and messy black hair, typically seen wearing a purple-striped sweater, dark blue jeans held up by a brown belt, and white socks with gray highlights. When manifesting in-game, Sarah's skin turns to a gravely pale complexion due to her death, and from there can manifest into a decayed corpse to torment her former friends.