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TadashiEdit

Main character of Gyo. In the beginning it shows that he loves scuba. He has a girlfriend named Kaori and an uncle named Koyanagi. He noticed something was funny when Kaori said he had bad breath, although he brushes his teeth twice a day. He tries to save Kaori but in the end he fails to do so. He is trying to help with the fight against the creatures. At the end he joins a group of university students, who happens to be immune from the death stench, to create a vaccine to defeat the disease. He's the only survivor of the main characters and appears to be immune.

KaoriEdit

Tadashi's girlfriend. She has an extremely sensitive nose and becomes very jealous when Tadashi is near other women. Near the beginning of the series Kaori started noticing the odd smell. She and Tadashi tried to escape and went to Koyanagi's lab. Due to her overly sensitive nose, she seems to be able to sense when the creatures are coming. However, she is later infected, causing her body to swell up and be covered in boils. The germ also forces the gas with the "death stench" out of her body. Because of this, she began to think she was disgusting, that Tadashi wouldn't love her if she wasn't beautiful, and she would never be healed. This, along with the horrible stench, made her hang herself from the wires of a ceiling lamp. But the wires were weak and could not support her additional weight with the gas bloating her. Tadashi then immediately carries her to his uncle Koyanagi's lab for aid . It turns out Koyanagi rigs her up to a custom walking machine. Ultimately, she becomes like the walking dead creatures, except for one quality - she has a will of her own. Later she was captured by the Citrous Circus, whose ringmaster was using the infected creatures and humans along with the gas, as attractions. Kaori escaped and fled. Tadashi dragged her back to Uncle Koyanagi's lab . But when she escaped outside again after thinking Tadashi was now attracted to Ms. Yoshiyama, she was attacked by the other creatures. It is likely that this was because they saw her man-made walking machine as a threat to their existence. Near the end of the series, Tadashi finds her burnt corpse, commenting on how she is 'finally rid of the smell'.

Dr. KoyanagiEdit

Uncle of Tadashi, an inventor and has an assistant, Ms. Yoshiyama. He tries to figure out what makes the fish move. He once smelled a human corpse, relating the stench to the stench of the creatures. It was his father who died of a heart attack in a factory during a hot summer. While dissecting the fish he notices that although the fish is dead the walker's legs still function. When he got too close, the legs then clamped onto him. He cut off his arm to prevent the infection from spreading to the rest of his body. He is fascinated by the machine, not caring that he lost an arm to it. He gets stabbed by Kaori's spider-like leg and dies. He puts himself on a flying version of the mechanical legs and tried to kill Tadashi and Yoshiyama, presumably because he assumed that Tadashi and Ms. Yoshiyama had become partners, but failed. Outside he waited for them to leave the building, and took Yoshiyama with him before flying away. He is last seen as the Citrous circus and other walking machines attempt to bring him down by gas cannon, only for his own machine to extend metallic wings and escape.

Ms YoshiyamaEdit

Assistant of Doctor Koyanagi, she cares for him and tries to help him. When she was seen with Tadashi by Kaori, Kaori tried to attack her. Ms. Yoshiyama then ran outside where she was captured by the Mechanical Koyanagi. Her final fate is never revealed.