Observer Zero is an antagonist in Azur Lane. She is a very mysterious Siren. She has access to various timelines and can predict the future. She enjoys observing. Observer Zero was told by the Inquisitor that the fate of humanity is in her hands and accepted the mission given to her. a girl with a pale body, her hair is white with a few blue strands, and her eyes glow blue. She wears a white sleeveless dress, with eight long, thick cables behind her that look like tendrils connected to the nape of her neck or perhaps her back, a black and blue ring-like object around her neck that has details like an eye or gem in the center. This necklace also has a light blue ribbon or knot accent at the top, on her wrist she wears something like a thick furry or plush bracelet, has rigging that is shaped like a whitish blue jellyfish that is somewhat transparent, under which there are eight dark blue chains and some black parts that resemble jellyfish tentacles, it can be seen that this ship has two triple main guns and a torpedo tube launcher, and in the middle between the two guns there is a curved metal part that which might be where Observer Zero sits.