Nine a large greenish-grey numeral shaped like a "9", living in Mainframe. Unlike most people, Nine has very large fangs, sharp teeth and red eyes. Nine is one of two numerals that has two eyes, the other being Five.
He attended Bob's lecture on 'Games Survival' and was overly-excited at the prospect of fighting the User. (AndrAIa)
While Nine's appearance and behavior seems vicious, oddly he also works for Phong within the Principal Office. He apparently works as a waiter/caterer or butler of sorts within the massive facility. He also has some back problems.