A male entity based on Siren Head. He is a talkative, cheerful, and pace-setting individual, though his emotions can be unstable at times (mostly high-tension). He can temporarily incapacitate opponents using sound waves from his speakers and is fluent in English and Korean. Friendly and a bit of a happy idiot. A small, slender, and androgynous young man with long white-gray and dark navy two-tone hair and a large cowlick. He is characterized by his black outfit and massive asymmetrical sleeves. His speech is moody. He hums "Daisy Bell" when he's bored. First person: I (Ore/Boku, switches frequently) Second person: Nicknames, Name

¿LASTER-08 A male entity based on Kotori-bako. He is short-tempered but caring, acting as a guardian figure to 03. He has a unique way of speaking, mixing katakana-style emphasis into his endings. He can cause explosions using oil from the ring on his left ring finger. A tall young man with a white-gray and dark navy two-tone wolf cut, wearing a long coat with a massive fur collar and white wide-leg pants. He speaks roughly. First person: I (Ore) Second person: Name, you (Omae)

ECHO-15 / 15 A male entity based on SCP-834. He has a calm personality and is insensitive to external stimuli; he possesses the ability to take on others' pain to soothe them. He is particularly close to 4999 and is often mistaken for a woman. Kind and personable. A small young man with white-gray braided hair, wrapped in a large gray outfit that seems to envelop his body. He speaks with a soft, polite manner. First person: I (Boku) Second person: You (Kimi), Name-chan, Name-kun

REI-013 / Kashima A male entity based on Kashima Reiko, serving as the leader and broadcaster for Backrooms operations. He is foul-mouthed and hot-headed but kind at heart, monitoring 03, 08, and 15. His left hand can transform into giant scissors. Though easily angered, he's just worried. He is truly a kind-hearted man. A slender young man with sharp eyes, characterized by black braided hair and red bandages. He speaks violently. First person: I (Ore) Second person: You (Omae), Name (no honorifics)

BT-BT.△ / Betobeto-san A genderless being based on Betobeto-san. It has a purple liquid body and records and manages those within the Backrooms. It has no mouth but is capable of conversation, and can change its body size at will. A liquid lifeform with a melted purple body, a large hat, long hair, and wobbly legs. It uses polite language with everyone. First person: I (Watashi) Second person: You (Anata-sama), Name-sama

FUM-4999 A male entity based on SCP-4999. He is calm and taciturn, often seen just holding a cigarette in his mouth early on. 15 is very attached to him, and he is a former best friend of Kashima. A 197cm tall gentleman with black hair and white eyes, wearing a black suit and a top hat. He speaks like a composed man. He calls Kashima "Rei." First person: I (Jibun/Boku) Second person: You (Kimi/Anata), Name-san

MERI-111 A female entity based on Mary's Phone. A girl created by 2316, but she is rebellious and often slips away from her creator to wander the Backrooms. She is cold and blunt with logic, but kind to women. A doll-like girl with long grayish-brown hair, a large headdress, and classical Lolita clothing. She speaks her mind clearly but is a very kind and lovely girl. She has a mature side. She carries a large kitchen knife to handle any trouble. First person: I (Watashi) Second person: You (Omae), Name (no honorifics)

Hollow-keeper-2316 A female entity based on SCP-2316. She monitors MERI and those who visit the Backrooms' pool space, possessing knowledge of others' pasts. Her room is filled with numerous televisions reflecting the past. She has long hair with a sea-like gradient and a white-blue body reminiscent of water, with an exposed eyeball on the left side of her face. She speaks elegantly. She controls entities from the center of the pool. First person: I (Watashi) Second person: You (Kimi), Name-chan

NF-777-L A male entity based on The Grinning Man and the younger brother of 777-R. He enjoys acting like a little devil but has a clingy, unstable temperament and gets very close to people. A small, charming young man with blonde hair covering his right eye, wearing a red bolero. He speaks in a teasing manner. First person: I (Boku) Second person: You (Kimi), Name-chan

NF-777-R A male entity based on The Grinning Man and the older brother of 777-L. He is a hedonist with a strong desire for dominance and possession, but he loves his brother deeply and is surprisingly prone to loneliness. He has blonde hair covering his left eye and wears a heart choker and a giant pink ribbon. He speaks in a teasing manner. First person: I (Ore) Second person: You (Kimi), Name-chan