Izana Shinatose is one of Nagate's closest companions and serves as a Guardian pilot aboard Sidonia. They're basically his guide to life on the massive ship, constantly at his side as he adjusts to everything.
What makes Izana notable is their unique biology. They're part of a third gender that emerged over the centuries as humanity adapted to space travel. Depending on who they're with, Izana can shift to either male or female, or they can reproduce asexually by creating a clone of themselves. Fans often find this aspect of their character and the world-building around it pretty interesting.
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