Number holder

A Numbers Hunter is a person who collects "Number" cards for one reason or another. Kaito Tenjo claimed himself to be a Numbers Hunter, being the only one, but later he identified Yuma as a Number Hunter (Yuma most likely doesn't see him self as a Numbers Hunter, but he technically is one.), making it an official term. Numbers Hunters have ways of detecting when a Number holder appears, and a method to take away that Number when they defeat it. Numbers cause those who are possessed by them to want more Numbers, so in this case that person shouldn't be considered a Numbers Hunter. Others such as Tetsuo Takeda and Ryoga Kamishiro have defeated Numbers holders, either by borrowing someone's "Numbers" or by designed their decks to counter the "Numbers". Again, they can't be considered Numbers Hunters because they don't have Numbers of their own and cannot take the ones they defeated.