KOS-MOS has long blue hair and red eyes. She has a visor which she uses during powerful attacks. She wears a white bodysuit with yellow armour, long white and black gloves, and long white boots with black stockings.
She also has a powerful X-BUSTER beam attack. When KOS-MOS uses this attack, her abdomen opens outwards.
Below are visuals of KOS-MOS from Xenosaga: The Animation anime DVDs and the Xenosaga Episode I: Der Wille zur Machtnosaga PlayStation 2 game.
Below are special screenshot pinups of KOS-MOS, from the Xenosaga: The Animation anime.
Below are screenshots of KOS-MOS, from the Xenosaga: The Animation anime.