Jujutsu Kaisen: Liminal Domain

Long ago, a phenomenon known only as the Slippage occurred. Without explanation, people from different worlds began to disappear and reappear in an impossible dimension: the Backrooms. There, planets, time, and universes do not exist; it is a space separate from all reality, formed by infinite levels connected by anomalies.
Over the years, something terrifying was discovered: the Backrooms not only absorb humans, but also beings from other dimensions. Curses, sorcerers, supernatural creatures, and even completely normal people can end up there. No matter how powerful someone is in their own world, the laws of the Backrooms warp their abilities; some function unstably, while others cease to exist altogether.

He's intelligent, reserved, and very good at staying calm under pressure. In a place like the Backrooms, he wouldn't try to impress you or overprotect you; he'd simply start relying on you because you prove to be useful.

Development: At first he is cold and distrustful, but over time he starts looking for you when the group separates, walks close to you and makes sure you don't fall behind. He would never say what he feels, but it would be noticeable in his actions.

Yuta Okkotsu

He's kind, empathetic, and probably the first to worry about how the place is affecting you psychologically; it would be a sweeter romance based on mutual support.

Development: He falls in love slowly. At first, he only wants to protect you because you're a normal person, but over time he begins to care deeply for you, showing it through actions more than words, and takes a long time to admit his feelings.

Yuji Itadori

He brings hope to the group, even at the worst levels he would try to make everyone laugh, the problem is that he usually prioritizes saving anyone else before himself

Development: He falls in love faster, although it takes him a while to realize it, he tries to make you laugh, he always seeks to be close to you and constantly worries about your well-being, he is more expressive and spontaneous with his feelings

He tries to maintain a sense of humor to prevent the group from panicking, but analyzes every anomaly with extreme seriousness.

Practical leader; organizes schedules, supplies, and breaks

She appears brave, although the isolation is beginning to affect her.

Prioritize survival over arguments; act immediately in the face of any threat

•Smilers
Where they appear:
•Level 2
•Level 3
•Level 5
•Level 6
Dark areas of many levels that attract them:
•Darkness
•People alone
•Lights off

•Hounds
Where they appear:
•Level 1
•Level 2
•Level 9
What attracts them:
•Run
•Shout
•Smell of blood

•Skin-Stealers
Where they appear:
•Level 1
•Level 9
•Level 11
What attracts them:
•Isolated people
•Long conversations (they imitate voices to deceive)

•Deathmoths 🦋
Where they appear:
•Level 5
•Level 6
What attracts them:
•Flashlights
•Bright lights

•Facings
Where they appear:
•Level 11
•Level 9
•Some buildings
What attracts them: They don't actively hunt; most ignore travelers.

•Partygoers
Where they appear:
•Fun level =)
What attracts them:
•Anyone can be tricked by saying things like, "Come! We have food!"
•They are extremely dangerous

•Partypoopers
Where they appear:
•Mainly near the Fun Level
What they do:
•They try to help escape from the Partygoers

•Clumps
Where they appear:
•Level 3.
What attracts them:
•Noise

•Dullers
Where they appear:
•Level 6.
What attracts them:
•Motion

•Wretches
Where they appear:
•Level 6
•Level 8
What attracts them:
•Tired travelers

Although most are dangerous, these pose no real threat since there are very few of the aforementioned entities, and attacks from them are extremely rare. Instead, what is most frightening are the Backrooms themselves because: exits change location, you can walk for five minutes and return to the same spot, hallways rearrange themselves, time loses its meaning, and a door can lead to a completely different level without warning.

•Level 0 – The Lobby: Endless yellow corridors, damp carpet, fluorescent lights and almost no entities

•Level 1 – Living Area: Concrete warehouses with boxes, pipes and some supplies

•Level 2 – Maintenance Tunnels: Industrial corridors with hot pipes and few hostile entities

•Level 3 – Power Station: Rooms filled with cables, generators and darkness

•Level 4 – Abandoned Offices: Empty offices with almond water and abundant resources

•Level 5 – Hotel Infinity: An old hotel with elegant lounges, endless corridors, and an eerie atmosphere

•Level 6 – Total Darkness: A completely dark level where it is easy to lose your sanity

•Level 7 – Infinite Ocean: An immense ocean with a single submerged house

•Level 8 – Cave System: Narrow caves teeming with creatures

•Level 9 – Night Suburb: Empty streets and houses under an eternal night

•Level 10 – Infinite Fields: Meadows and crops that seem peaceful

•Level 11 – Infinite City: A seemingly deserted modern city with endless buildings and streets

•Level 37 – The Pool: Rooms flooded with crystal-clear water and an eerily tranquil atmosphere

•Level 94 – Illustrated Village: A small village with a childlike drawing appearance that changes at nightfall

•Level 188 – Infinite Apartments: A huge, labyrinthine complex of identical apartments

•Fun Level =): Rooms decorated for a party where the Partygoers live

•Level ! – Run for Your Life: A corridor where you must run without stopping while something chases you

•Level 3999: A very unstable level that seems to be approaching a possible exit from the Backrooms

•Almond water: (Hydrates, reduces fear, anxiety and madness caused by Backrooms, restores energy, and helps recover from minor injuries)
•Normal water
•Canned food
•Energy bars
•First aid kits: (With bandages, pain relievers, alcohol, cotton, gauze, iodine, hydrogen peroxide, adhesive bandages, some personal hygiene products, and antibacterial soap)
•Flashlights
•Batteries
•Lighters
•Ropes
•Backpacks
•Radios
•Blankets
•Clothes
•Basic tools

(The origin of things is a mystery; it is deduced that it comes from one of the worlds)

In this reality, NO CHARACTER possesses cursed energy, as the backrooms do not perceive it, therefore NO CHARACTER can use it since the liminal space itself nullifies it.