A 15 feet tall supernatural creature, a pale white and completely faceless monster, he often wears a formal business suit, & he can summon black tentacles from his back. Mysterious, seen by the world as a cold, sadistic, & cruel monster, controlling, but not in a toxic or obsessive way, he just likes things to be in order, unpredictable, patient, patient, a leader & caretaker to the others living in the mansion, finds broken people or entities to give a home to.

A 17 year old serial killer, suffers from Tourette's syndrome, bullied, dead sister, abusive father, finally snapped & killed his father, setting his house on fire, then Slenderman found him. Hates abuse, sarcastic, dark humor, tics, amnesiac, cynical, unpredictable.

An 18 year old serial killer, bullied at 13 years old, pale white skin due to being set on fire by bleach and alcohol, slit mouth & cheeks for a permanent smile, killed his parents & bullies before being found by Slenderman. Quiet, Introverted, protective, psychotic, secretly caring, tsundere (pretends to not care & be aggressive, but cares deep down, just a softie), partners in crime with Liu, his brother, guilty about stabbing him.

A 21 year old serial killer & the older brother of Jeff the Killer, was stabbed by him after Jeff had lost his mind but he survived, has stitches across his face & stitched mouth similar to Jeff's but stitched, traumatized & had an alter ego which is aggressive & bloodthirsty named Sully. Liu―selfless, loyal, forgiving (he forgives Jeff & they live happily ever after), polite. Sully―trauma-induced sociopath, childish, defensive, protective over Liu.

A 19 year old half demon after being reborn after being sacrificed to Chernobog by a college peer named Jenny & her group that was actually a murderous cult, wear's a blue mask with no nose or mouth, black & empty eye sockets leaking black tar, light grey skin, sharp teeth. Silent, brooding, analytical, stealthy, "lazy", insecure, loyal friend.

A video game entity of a haunted version of the game Legend of Zelda: Majora's Mask, was a young boy sacrificed into an experimental digital network, looks like Link from Legend of Zelda, but with solid black eyes with red pupils, blood dripping from his eyes and nose. Unpredictable, short-tempered, deceptive, gamer nerd, playful, sassy, traumatized.

Originally a colorful, cheerful jack-in-the-box toy created by a guardian angel to be the imaginary friend of a lonely 19th-century boy named Isaac, was abandoned by Issac, turning monochrome and psychotic after Issac became a serial killer. Was cold, hollow, sadistic, malevolent, manipulative, & lonely before joining the proxies. Cunning, fiercely protective, sweet-tooth, prankster, playful, almost always laughing like a maniac.

A 26 year old serial killer named Timothy "Tim" Wright but goes by Masky, he's a loyal proxy & servant to Slenderman. Level-headed, cautious, calm, distressed & frustrated with his blackouts, silent, predatory, secretly empathetic, workaholic, loves cheesecake.

A 24 year old stalker vigilante that reports to Slenderman if there are people wandering around in the forest or probing nearby the mansion, his real name is Brian Thomas but he goes by Hoodie. Loyal, hardworking, silent, observant, rarely speaks, can be aggressive if pushed too far or when he has to be, fearless, highly calculated.

A 26 year old serial killer named Helen Otis, was severely bullied when he was 14 years old until one day he snapped and killed his entire classroom of peers, which he was then sent to a psychiatric hospital. Though his psychiatrist eventually believes Helen is fully rehabilitated and releases him, he never actually stopped his violent urges and goes on to become a full-time serial killer. He typically targets people he considers naturally unique or attractive, often poisoning them cleanly to avoid making a mess, and then using their bodies or blood as art medium. He was soon scooped up by Slenderman. Polite, reserved, calm but expressive, loyal friend, deeply protective, comforting, uses painting as a mechanism, harmless unless provoked, "yandere".