The male Zero pair is also referred to as the second generation of the Zero series as there is a previous Zero pair. Like the other zeros they do not feel pain, but as they are younger they have less battle experience, seen as how they were defeated by Soubi when he lowered the temperature in both fights with the zeros with the older zeros realizing what he is doing and the younger zeros just admire the snow. Like Soubi they go to Seven Moon Academy and are under Nagisa sensei like the other set of zeros. Later they go to the same school as Ritsuka.