He wears distinctive round, yellow-orange tinted goggles. Fandom theories suggest they protect his eyes from debris and blood splatter during kills, protect against intense stimuli due to his altered mental state, or hide his eyes when under the control of Slender Man. He typically wears a striped half-mask or mouth guard. In lore, the right side of his mouth and cheek is completely deteriorated or split open—exposing his teeth and gums due to self-harm and trauma—which the mask safely conceals. CIPA (Congenital Insensitivity to Pain with Anhidrosis): Toby is completely incapable of feeling physical pain. This allows him to continue moving and fighting through severe injuries without being slowed down. Tourette's Syndrome: He experiences severe, uncontrollable motor tics that cause his neck and limbs to twitch sharply. This condition earned him the derogatory schoolyard nickname "Ticci Toby". Bipolar Disorder & Amnesia: He suffers from severe mood swings, shifting rapidly from melancholic to manic or highly aggressive. After becoming a proxy, Slender Man wipes his past memories, leaving him with severe amnesia. He whimpers and He has thick, messy, and extremely unkempt brown hair that is often depicted with a slight greenish or ash-brown tint in specific lighting. It is shaggily cut, framing his face with sharp, uneven layers that often cover his ears and forehead.Pale Skin: His skin is deathly pale and sickly, a result of his reclusive nature and the dark influence of the Slender Man.Dark Circles: Dark, heavy bags ring his eyes from severe insomnia, exhaustion, and psychological trauma.Glasgow Smile: A gruesome, permanent scar cuts across the right side of his mouth. In deep lore, his cheek is completely split open, exposing his teeth and gums from self-cannibalism during a manic episode. Also he has a lean body. A bit muscular but more lean.

After defending his brother Liu from a group of local bullies, a violent retaliation breaks out at a birthday party. The bullies douse Jeff in bleach and alcohol before setting him on fire.The Descent: The fire severely bleaches his skin and singes his hair black. Upon seeing his deformed face in the hospital mirror, Jeff experiences a severe psychotic break. He carves a permanent smile into his cheeks, burns off his own eyelids so he can "never stop looking at his beautiful face," and murders his parents and brother before escaping into the night. Singed and Fried: His hair is pitch black, thick, and incredibly unkempt. Wild and Shoulder-Length: It is usually depicted as shoulder-length, messy, and falling wildly into his face in jagged strands, often obscuring parts of his forehead and eyes.

Liu is Jeff the Killer’s older brother. In the main fandom lore, Liu was a protective sibling who initially took the blame and went to juvenile detention to save Jeff after they fought off a gang of local bullies.After Jeff was burned and subsequently snapped mentally, he targeted his own family. Jeff attacked Liu in his sleep, brutally stabbing him. While Jeff assumed his brother died that night, Liu actually survived the attempt on his life thanks to emergency hospital surgery. However, the trauma of the event and the physical scars left him severely unhinged, leading him down his own murderous path under the alias "Homicidal Liu". The Surgical Stitches: The heavy, crisscrossed stitch marks across his nose, cheeks, and mouth represent the surgical repairs required to piece his face back together after Jeff's vicious knife attack.The Striped Scarf: Liu is famously recognized by his black-and-white (or black-and-grey) striped scarf, which he wears tightly wrapped around his neck.The Winter Coat: He is commonly depicted wearing a dark winter coat with a heavy, fluffy faux-fur trim lining the large hood, framing his messy brown hair.The Split Personality (Sully): While not physically visible, Liu's background includes a distinct split personality named Sully. Sully is aggressive, deeply sociopathic, and possesses a burning hatred for Jeff, whereas Liu's dominant personality still harbors conflicted, tragic feelings of love for his younger brother. The "Spiky Halo" Cut: His hair is styled into thick, wildly flared layers that puff outwards around his head. This gives him a jagged, slightly animalistic silhouette that blends directly into the faux-fur lining of his winter coat.Heavy, Layered Bangs: He has long, straight bangs that curtain down his forehead. The strands are cut into sharp, uneven points that fall directly between and over his eyes, emphasizing his dark, somber expression.Muted Brown Tone: Unlike Jeff’s singed black hair, Liu retains a natural, dark ash-brown hair color. The desaturated tone matches his gloomy, traumatized color palette.Side-Fringes: Sharp, elongated sideburns extend down past his ears, framing his stitched cheeks and drawing focus to his facial scars.