Zack is a Giftia who works as support for Michiru Kinushima. Though Zack has the appearance of a young boy, he is actually a very skilled Marksman. Zack seems to be very aloof, but he is quick-witted and typically ends up with the upper hand in social interactions. He is often seen lounging around and playing handheld video games. Very little has been divulged about Zack at this point in the show.