This is what I think their neckbeard nests would look like canonically:

1. ⁠Rei would have a mess of bloody bandages covering the floor. There’s broken glass next to the window which she doesn’t bother to fix. She has to force open the door due to the mass of mail accumulating on the doormat. The whole room smells like when you take off your cast after months of wear.
2. ⁠Shinji’s room is relatively clean. Most of his stuff is still in luggage because he never feels quite at home. He definitely cums in his own underwear and has to sneak past Misato on laundry day to make sure she doesn’t see. He hides these under the bed along with one piss bottle he uses at night. The room smells like cum.
3. ⁠Misato’s room is littered with beer cans and dirty laundry. She sleeps on the floor and has to push these things aside. She hasn’t washed her sheets in months. The clothes are somewhat soggy from the tons of towels she uses after showering. The room smells like mold and hair conditioner.
4. ⁠Asuka’s room is covered in boxes and Amazon envelopes, half of them ripped open. Her gamer station has half-eaten bags of Doritos. She has a chair where she puts her lounging clothes, which she barely cleans. The room smells like cheap candle wax, cheese, and cardboard.
5. ⁠Ritsuko’s room is covered in a thin film of nicotine, cat hair, and dust. Her room is the least gross of them all, but it’s littered with hobby projects she keeps leaving behind. She keeps a picture of Gendo under her pillow. The room smells like plastic and baby powder.
6. ⁠Kaworu doesn’t even have a room. He smells like steel and salt.
7. ⁠Maya’s room has a pile of takeout and pizza boxes over the microwave. The main form of trash is grocery bags full of trinkets. She has a gaming laptop that overheats and no desk to put it on. Her room smells like incense and linen.