The Zero teams were created by Nagisa. They work independently, and both teams assumed they were the first and only Zeros.

Sagan Natsuo (目奈津生) and Sagan Youji (目瑶二)

Natsuo and Youji are, to say it honestly, little bastards. They have no sense of touch, hot or cold, and appear to have extremely under-developed emotions. After losing a battle to him, the boys are taken in by Soubi and live at his apartment for several volumes. Given the very vague passage of time in the story, this could have been anywhere from a few days to a few weeks.

The location of their markings is unknown.

Nakano Yamato (中野倭) and Sakagami Kouya (坂上江夜)

These two seem to have met when they were 10 or 11, and might be the very first set of Zeros. Before leaving Nagisa, the girls went to high school (albeit different ones), and appear to have led somewhat of an ordinary life.

In a 2005 interview with Puff, Kouga hinted at bringing Yamato and Kouya back, but as of December 2007 they have still not made another appearance.

Their markings are on their breasts.