Tadashi is the main character of Gyo .
Tadashi has a dark brown hair.
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.
- Kaori! There You Are! (Tadashi asking a dead kaori)