999

999 was a friend of 21's at the Digitiza Hotel.

He had only moved into the hotel recently and became friends with 21.

On the day of the Incident, 999 called 21 into the Number Recreation Room of the hotel, along with 10 and 3.6. He told them about a new hidden room that he had found. Due to talking about hidden rooms in public, they were confronted by 209 and his brothers. He shot 209.3 and used one of his nines to knock him down. He was hit himself, and collapsed on a couch. He called out to 21, but died shortly after.